Pyaemic
Py•ae´mic, a. Of or pertaining to pyaemia; of the nature of pyaemia.

Pycnaspidean
Pyc•nas•pid´e•an, a. [Gr. thick, crowded +,, a shield.] (Zoöl.) Having the posterior side of the tarsus covered with small irregular scales; — said of certain birds.

Pycnidium
Pyc•nid´i•um, n. ; pl. Pycnidia (#). [NL., fr. Gr. crowded.] (Bot.) In certain fungi, a flask-shaped cavity from the surface of the inner walls of which spores are produced.

Pycnite
Pyc´nite, n. [Gr. thick.] (Min.) A massive subcolumnar variety of topaz.

Pycnodont
Pyc´no•dont, n. [Gr. thick, crowded +,, a tooth.] (Paleon.) Any fossil fish belonging to the Pycnodontini. They have numerous round, flat teeth, adapted for crushing.

Pycnodontini
Pyc•no•don´ti•ni, n. pl. [NL.] (Zoöl.) An extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs ( pleurolepida) and with enameled rhomboidal scales.

Pycnogonid
Pyc•nog´o•nid, n. (Zoöl.) One of the Pycnogonida.

Pycnogonida
Pyc•no•gon´i•da, n. pl. [NL., fr. Gr. thick crowded + knee.] (Zoöl.) A class of marine arthropods in which the body is small and thin, and the eight legs usually very long; — called also Pantopoda. The abdomen is rudimentary, and the triangular mouth is at the end of a tubular proboscis. Many of them live at great depths in the sea, and the largest of them measure two feet across the extended legs.

Pycnometer
Pyc•nom´e•ter, n. [Gr. dense, compact + -meter.] (Physics) A specific gravity bottle; a standard flask for measuring and comparing the densities of liquids. [Also written pyknometer.]

Pycnostyle
Pyc´no•style, a. [Gr. with the pillars close together; close + a column, pillar: cf. F. pycnostyle.] (Anc. Arch.) See under Intercolumniation. - n. A pycnostyle colonnade.

Pyemia
Py•e´mi•a, n. (Med.) See PyAEmia.

Pygal
Py´gal, a. [Gr. the rump.] (Anat.) Situated in the region of the rump, or posterior end of the backbone; — applied especially to the posterior median plates in the carapace of chelonians. { Py´garg, Py•gar´gus }[L. pygargus, Gr., literally, white rump; the rump + white: cf. F. pygargue.]
1. (Zoöl.) A quadruped, probably the addax, an antelope having a white rump. Deut. xiv. 5.
2. (Zoöl.) (a) The female of the hen harrier. (b) The sea eagle.

Pygidium
Py•gid´i•um, n. ; pl. Pygidia (#). [NL., fr. Gr., dim. of the rump.] (Zoöl.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite. { Pyg´my, Pyg•me´an } a. [L. pygmaeus. See Pygmy.] Of or pertaining to a pygmy; resembling a pygmy or dwarf; dwarfish; very small. " Like that Pygmean race." Milton. Pygmy antelope (Zoöl.), the kleeneboc. — Pygmy goose (Zoöl.), any species of very small geese of the genus Nettapus, native of Africa, India, and Australia. — Pygmy owl (Zoöl.), the gnome. — Pygmy parrot (Zoöl.), any one of several species of very small green parrots ( Nasiternae), native of New Guinea and adjacent islands. They are not larger than sparrows.

Pygobranchia
Py•go•bran´chi•a, n. pl. [NL., fr. Gr. pugh• the rump + a gill.] (Zoöl.) A division of opisthobranchiate mollusks having the branchiae in a wreath or group around the anal opening, as in the genus Doris.

Pygopod
Py´go•pod, n. [Gr. pygh• rump + -pod.]
1. (Zoöl.) One of the Pygopodes.
2. (Zoöl.) Any species of serpentiform lizards of the family Pygopodidae, which have rudimentary hind legs near the anal cleft, but lack fore legs.

Pygopodes
Py•gop´o•des, n. pl. [NL.] (Zoöl.) A division of swimming birds which includes the grebes, divers, auks, etc., in which the legs are placed far back.

Pygopodous
Py•gop´o•dous, a. (Zoöl.) Of or pertaining to the Pygopodes.

Pygostyle
Py´go•style, n. [Gr. pygh• the rump + a pillar.] (Anat.) The plate of bone which forms the posterior end of the vertebral column in most birds; the plowshare bone; the vomer. It is formed by the union of a number of the last caudal vertebrae, and supports the uropigium.

Pyin
Py´in, n. [Gr. pus.] (Physiol. (Chem.) An albuminoid constituent of pus, related to mucin, possibly a mixture of substances rather than a single body.

Pyjama
Py•ja´ma, n. [Hind. pae- jama, literally, leg clothing.] In India and Persia, thin loose trowsers or drawers; in Europe and America, drawers worn at night, or a kind of nightdress with legs. [Written also paijama.]

Pyjamas
Py•ja´mas or chiefly U. S. Pa•ja´mas n. pl. A garment similar to the Oriental pyjama (which see) adopted among Europeans Americans and other Occidentals for wear in the dressing room and during sleep also a suit of drawers and blouse for such wear.

Pykar
Pyk´ar, n. An ancient English fishing boat.

Pyla
Py´la n. ; pl. L. Pylae (#), E. Pylas (#). [NL., fr. Gr. an entrance.] (Anat.) The passage between the iter and optocœle in the brain. B. G. Wilder.

Pylagore
Pyl´a•gore, n. [Gr. ; Pylae, or Thermopylae, where the Amphictyonic council met + to assemble: cf. F. pylagore.] (Gr. Antiq.) a deputy of a State at the Amphictyonic council.

Pylangium
Py•lan´gi•um, n. ; pl. Pylangia . [NL., from Gr. an entrance + a vessel.] (Anat.) The first and undivided part of the aortic trunk in the amphibian heart. — Py•lan´gi•al (#), a.

Pylon
Py´lon, n. [NL., fr. Gr. a gateway.] (a) A low tower, having a truncated pyramidal form, and flanking an ancient Egyptian gateway.
"Massive pylons adorned with obelisks in front." J. W. Draper. (b) An Egyptian gateway to a large building (with or without flanking towers).

Pylon
Py´lon, n.
1. A tower, commonly of steelwork, for supporting either end of a wire, as for a telegraph line, over a long span.
2. (Aëronautics) (a) Formerly, a starting derrick (the use of which is now abandoned) for an aëroplane. (b) A post, tower, or the like, as on an aërodrome, or flying ground, serving to bound or mark a prescribed course of flight.

Pyloric
Py•lor´ic, a. [Cf. F. pylorique.] (Anat.) Of, pertaining to, or in the region of, the pylorus; as the pyloric end of the stomach.

Pylorus
Py•lo´rus, n. ; pl. Pylori (#). [L., fr. Gr. pylorus, gate keeper; a gate + watcher, guardian.] (Anat.) (a) The opening from the stomach into the intestine. (b) A posterior division of the stomach in some invertebrates.

Pyne, n. & v. See Pine. [Obs.] Chaucer.

Pyocyanin
Py•o•cy´a•nin, n. [Gr. pus + dark blue.] (Physiol. (Chem.) A blue coloring matter found in the pus from old sores, supposed to be formed through the agency of a species of bacterium ( Bacillus pyocyaneus).

Pyogenic
Py•o•gen´ic, a. [Gr. pus + root of to be born.] (Med.) Producing or generating pus.

Pyoid
Py´oid, a. [Gr. pus + - - oid.] (Med.) Of or pertaining to pus; of the nature of, or like, pus. Pyoid corpuscles (Med.), cells of a size larger than pus corpuscles, containing two or more of the latter.

Pyopneumothorax
Py•op•neu•mo•tho´rax, n. [Gr. pus + E. pneumothorax.] (Med.) Accumulation of air, or other gas and of pus, in the pleural cavity.

Pyot
Py´ot, n. (Zoöl.) The magpie. See Piet.

Pyracanth
Pyr´a•canth, n. [Gr. fire + a thorn, prickly plant.] (Bot.) The evergreen thorn ( Crataegus Pyracantha), a shrub native of Europe.

Pyral
Py´ral, a. Of or pertaining to a pyre. [R.]

Pyralid
Pyr´a•lid, n. [L. pyralis, -idis, a kind of winged insect.] (Zoöl.) Any moth of the family Pyralidae. The species are numerous and mostly small, but some of them are very injurious, as the bee moth, meal moth, hop moth, and clover moth.

Pyramid
Pyr´a•mid, n. [L. pyramis, -idis, fr. Gr.,, of Egyptian origin: cf. F. pyramide.]
1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or edifice of this shape.
2. (Geom.) A solid figure contained by a plane rectilineal figure as base and several triangles which have a common vertex and whose bases are sides of the base.
3. pl. (Billiards) The game of pool in which the balls are placed in the form of a triangle at spot. [Eng.] Altitude of a pyramid (Geom.), the perpendicular distance from the vertex to the plane of the base. — Axis of a pyramid (Geom.), a straight line drawn from the vertex to the center of the base. — Earth pyramid. (Geol.) See Earth pillars, under Earth. — Right pyramid (Geom.) a pyramid whose axis is perpendicular to the base.

Pyramid
Pyr´a•mid, v. i. (Speculation) To enlarge one’s holding or interest in a series of operations on a continued rise or decline by using the profits to buy or sell additional amounts on a margin, as where one buys on a 10% margin 100 shares of stock quoted at 100, holds it till it rises to 105, and then uses the paper profit to buy 50 shares more, etc. The series of operations constitutes a pyramid.

Pyramid
Pyr´a•mid, v. t. (Speculation) To use, or to deal in, in a pyramiding transaction. See Pyramid, v. i.

Pyramid
Pyr´a•mid, n. (Speculation) The series of operations involved in pyramiding. See Pyramid, v. i. { Pyr´a•zine, n. Also -zin }. [ Pyridine + Gr. not + life.] (Org. Chem.) A feebly basic solid, C₄H₄N₂, obtained by distilling piperazine with zinc dust, and in other ways. also by extension, any of various derivatives of the same.

Pyramidion
Pyr•a•mid´i•on, n. ; pl. Pyramidia (#). [NL., from L. pyramis. See Pyramid.] The small pyramid which crowns or completes an obelisk.

Pyramis
Pyr´a•mis, n. ; pl. Pyramides (#). [L.] A pyramid.

Pyramoid
Pyr´a•moid, n. See Pyramidoid.

Pyre, n. [L. pure, Gr., fr. fire. See Fire.] A funeral pile; a combustible heap on which the dead are burned; hence, any pile to be burnt.
"For nine long nights, through all the dusky air, The pyres thick flaming shot a dismal glare." Pope.

Pyrene
Py´rene, n. [Gr. fire.] (Chem.) One of the less volatile hydrocarbons of coal tar, obtained as a white crystalline substance, C₁₆H₁₀.

Pyrene
Py´rene, n. (Bot.) Same as Pyrena.

Pyrenoid
Py•re´noid, n. [Gr. like a kernel. See Pyrena, and -oid.] (Zoöl.) A transparent body found in the chromatophores of certain Infusoria.

Pyrethrine
Pyr´eth•rine, n. (Chem.) An alkaloid extracted from the root of the pellitory of Spain ( Anacyclus pyrethrum).

Pyretic
Py•ret´ic, a. [Gr. burning heat, fever, from fire: cf. F. pyretique.] (Med.) Of or pertaining to fever; febrile.

Pyretology
Pyr•e•tol´o•gy, n. [Gr. fever + -logy: cf. F. pyretologie.] (Med.) A discourse or treatise on fevers; the doctrine of fevers. Hooper.

Pyrexia
Py•rex´i•a, n. ; pl. Pyrexiae (#). [NL., fr. Gr. to be feverish, akin to fever.] (Med.) The febrile condition. { Py•rex´i•al, Py•rex´ic•al } a. (Med.) Of or pertaining to fever; feverish.

Pyrgom
Pyr´gom, n. [Gr. a place furnished with towers, fr. a tower.] (Min.) A variety of pyroxene; — called also fassaite.

Pyrheliometer
Pyr•he•li•om´e•ter, n. [Gr. fire + sun + -meter.] (Physics) An instrument for measuring the direct heating effect of the sun’s rays.

Pyridic
Py•rid´ic, a. (Physiol. Chem.) Related to, or formed from, pyridin or its homologues; as the pyridic bases.

Pyridine
Pyr´i•dine, n. [From Gr. fire.] (Physiol. Chem.) A nitrogenous base, C₅H₅N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaïnes, may be mentioned. See Lutidine.

Pyriform
Pyr´i•form, a. [L. pyrum, pirum, a pear + -form: cf. F. pyriforme, piriforme.] Having the form of a pear; pear- shaped.

Pyritaceous
Pyr•i•ta´ceous, a. (Min.) Of or pertaining to pyrites. See Pyritic.

Pyritize
Pyr´i•tize, v. t. [Cf. F. pyritiser.] To convert into pyrites.

Pyritohedral
Pyr•i•to•he´dral, a. [See Pyritohedron.] (Crystallog.) Like pyrites in hemihedral form.

Pyritoid
Pyr´i•toid, n. [ Pyrite + - oid.] (Crystallog.) Pyritohedron. [R.]

Pyritology
Pyr•i•tol´o•gy, n. [Gr. of fire + -logy.] The science of blowpipe analysis.

Pyritous
Pyr´i•tous, a. Pyritic. { Pyro-, Pyr- }. [Gr.,, fire.] Combining forms designating fire or heat; specifically (Chem.), used to imply an actual or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc.

Pyro
Py´ro, n. (Photog.) Abbreviation of pyrogallic acid. [Colloq.]

Pyroacetic
Pyr•o•a•ce´tic, a. [ Pyro- + acetic: cf. F. pyroacetique.] (Chem.) Pertaining to, and designating, a substance (acetone) obtained by the distillation of the acetates. It is now called also pyroacetic ether, and formerly was called pyroacetic spirit.

Pyroacid
Pyr•o•ac´id, n. [ Pyro- + acid.] (Chem.) An acid obtained by sybjecting another acid to the action of heat. Cf. Pyro-.

Pyroantimonic
Pyr•o•an•ti•mon´ic, a. [ Pyro- + antimonic.] (Chem.) Pertaining to, or designating, an acid of antimony analogous to pyrophosphoric acid.

Pyroarsenate
Pyr•o•ar´se•nate, n. (Chem.) A salt of pyroarsenic acid.

Pyroarsenic
Pyr•o•ar•sen´ic, a. [ Pyro- + arsenic.] (Chem.) Pertaining to or designating, an acid of arsenic analogous to pyrophosphoric acid.

Pyroborate
Pyr•o•bo´rate, n. (Chem.) A salt of pyroboric acid.

Pyroboric
Pyr•o•bo´ric, a. [ Pyro- + boric.] (Chem.) Pertaining to derived from, or designating, an acid, H₂B₄O₇ (called also tetraboric acid), which is the acid ingredient of ordinary borax, and is obtained by heating boric acid.

Pyrocatechin
Pyr•o•cat´e•chin, n. [ Pyro- + catechu.] (Chem.) A white crystalline substance, C₆H₄(OH)₂, of the phenol series, found in various plants; — so called because first obtained by distillation of gum catechu. Called also catechol, oxyphenol. etc.

Pyrochlore
Pyr´o•chlore, n. [ Pyro- + Gr. pale green.] (Min.) A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; — so called from its becoming grass-green on being subjected to heat under the blowpipe.

Pyrocitric
Pyr•o•cit´ric, a. [ Pyro- + citric: cf. F. pyrocitrique.] (Chem.) Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic, itaconic, and mesaconic acid.

Pyrocoll
Pyr´o•coll (pir"o•kol), n. [ Puro- + Gr. ko•lla glue.] (Chem.) A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.

Pyroelectric
Pyr•o•e•lec´tric, a. [ Pyro- + electric.] (Physics) Pertaining to, or dependent on, pyroelectricity; receiving electric polarity when heated.

Pyroelectric
Pyr•o•e•lec´tric, n. (Physics) A substance which becomes electrically polar when heated, exhibiting opposite charges of statical electricity at two separate parts, especially the two extremities.

Pyroelectricity
Pyr•o•e•lec•tric´i•ty, n. (Physics) Electricity developed by means of heat; the science which treats of electricity thus developed.

Pyrogallate
Pyr•o•gal´late, n. (Chem.) A salt of pyrogallic acid; an ether of pyrogallol.

Pyrogallic
Pyr•o•gal´lic, a. [ Pyro- + gallic.] (Chem.) Pertaining to, derived from, or designating, an acid called pyrogallol. See Pyrogallol.

Pyrogen
Pyr´o•gen, n. [See Pyrogenous.]
1. Electricity. [R.]
2. (Physiol. Chem.) A poison separable from decomposed meat infusions, and supposed to be formed from albuminous matter through the agency of bacteria.

Pyrogenous
Py•rog´e•nous, a. [Gr. fire + genous: cf. F. purogène, Gr. .] Produced by fire; igneous. Mantell. .

Pyrognostic
Pyr•og•nos´tic, a. [ Pyro- + Gr. to know.] (Min.) Of or pertaining to characters developed by the use of heat; pertaining to the characters of minerals when examined before the blowpipe; as the pyrognostic characters of galena.

Pyrognostics
Pyr•og•nos´tics, n. pl. (Min.) The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.

Pyrograph
Py´ro•graph, n. A production of pyrography.

Pyrography
Py•rog´ra•phy, n. [ Pyro- + -graphy.] A process of printing, ornamenting, or carving, by burning with heated instruments.

Pyrogravure
Py•ro•gra•vure´, n. [ Pyro- + F. gravure engraving.] Pyrography; also a design or picture made by pyrography.

Pyrolator
Py•rol´a•tor, n. [See Pyrolatry.] A fire worshiper. [R.] Southey.

Pyrolignite
Py•ro•lig´nite, n. A crude acetate produced by treating pyroligneous acid with a metal or basic compound; as pyrolignite of iron (iron liquor).

Pyrolignous
Pyr•o•lig´nous, a. Same as Pyroligneous.

Pyrology
Py•rol´o•gy, n. [ Pyro- + - logy: cf. F. pyrologie.] That branch of physical science which treats of the properties, phenomena, or effects of heat; also a treatise on heat.

Pyrolusite
Pyr•o•lu´site, n. [ Pyro- + Gr. to loose, or a loosing.] (Min.) Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).

Pyromagnetic
Pyr•o•mag•net´ic, a. [ Pyro- + magnetic.] (Physics) Acting by the agency of heat and magnetism; as a pyromagnetic machine for producing electric currents.

Pyromalate
Pyr•o•ma´late, n. (Chem.) A salt of pyromalic acid. [Obs.]

Pyromalic
Pyr•o•ma´lic, a. [ Pyro- + malic.] (Old Chem.) Pertaining to, or designating, an acid now called maleic acid.

Pyromancy
Pyr´o•man•cy, n. [Gr. ; fire + divination: cf. F. pyromancie.] Divination by means of fire.

Pyromania
Pyr´o•ma´ni•a, n. [ Pyro- + mania.] An insane disposition to incendiarism.

Pyromantic
Pyr´o•man´tic, a. Of or pertaining to pyromancy.

Pyromantic
Pyr•o•man´tic, n. [Cf. Gr. .] One who pretends to divine by fire. Sir T. Herbert.

Pyrometer
Py•rom´e•ter, n. [ Pyro- + -meter: cf. F. pyromètre.]
1. (Physics) An instrument used for measuring the expansion of solid bodies by heat.
2. (Physics) An instrument for measuring degrees of heat above those indicated by the mercurial thermometer. It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current. { Pyr•o•met´ric, Pyr•o•met´ric•al } a. [Cf. F. pyrometrique.] (Physics) Pertaining to, or obtained by, the pyrometer; as pyrometrical instruments; pyrometrical measurements.

Pyrometry
Py•rom´e•try, n. The art of measuring degrees of heat, or the expansion of bodies by heat.

Pyromorphite
Pyr•o•mor´phite, n. [G. pyromorphit, from Gr. fire + form.] (Min.) Native lead phosphate with lead chloride, occurring in bright green and brown hexagonal crystals and also massive; — so called because a fused globule crystallizes in cooling.

Pyromorphous
Pyr•o•mor´phous, a. [ Pyro- + -morphous.] (Min.) Having the property of crystallizing by the agency of fire.

Pyromucate
Pyr•o•mu´cate, n. (Chem.) A salt of pyromucic acid.

Pyromucic
Pyr•o•mu´cic, a. [ Pyro- + mucic.] (Chem.) Pertaining to, derived from, or designating, an acid obtained as a white crystalline substance by the distillation of mucic acid, or by the oxidation of furfurol.

Pyrone
Py•rone, n. [G. pyron, an abbr. of pyrokoman.] (Org. Chem.) An unsaturated cyclic compound, C₅H₄O₂, of which two varieties are known, α and γ. γ-pyrone is the parent substance of several natural yellow dyestuffs. Q.

Pyronomics
Pyr•o•nom´ics, n. [ Pyro- + Gr. law.] The science of heat.

Pyrope
Pyr´ope, n. [L. pyropus a kind of red bronze, fr. Gr. ; fire + the eye, face: cf. F. pyrope.] (Min.) A variety of garnet, of a poppy or blood-red color, frequently with a tinge of orange. It is used as a gem. See the Note under Garnet.

Pyrophone
Pyr´o•phone, n. [ Pyro- + Gr. sound.] A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas burning in tubes of different sizes and lengths. { Pyr•o•phor´ic, Py•roph´o•rous } a. [ Pyro- + Gr. to bear.] Light- producing; of or pertaining to pyrophorus. Pyrophoric iron (Chem.), finely reduced iron, which ignites spontaneously on contact with air.

Pyrophorus
Py•roph´o•rus, n. [NL. See Pyrophorous.] (Old Chem.) Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.

Pyrophosphoric
Pyr•o•phos•phor´ic, a. [ Pyro- + phosphoric.] (Chem.) Pertaining to, or designating, an acid, H₄P₂O₇, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

Pyrophyllite
Py•roph´yl•lite, n. [ Pyro- + Gr. leaf.] (Min.) A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.

Pyroscope
Pyr´o•scope, n. [ Pyro- + - scope: cf. F. pyroscope.] (Physics) An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf. [R.]

Pyrosis
Py•ro´sis, n. [NL., fr Gr. a burning, an inflammation, fr. to burn, fr. fire.] (Med.) See Water brash, under Brash.

Pyrosome
Pyr´o•some, n. [ Pyro- + - some body.] (Zoöl.) Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.

Pyrosulphate
Pyr•o•sul´phate, n. (Chem.) A salt of pyrosulphuric acid.

Pyrosulphuric
Pyr•o•sul•phu´ric, a. [ Pyro- + -sulphuric.] (Chem.) Pertaining to, or designating, an acid called also disulphuric acid) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, H₂S₂O₇ resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.

Pyrotartaric
Pyr•o•tar•tar´ic, a. [ Pyro- + tartaric.] (Chem.) Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid.

Pyrotartrate
Pyr•o•tar´trate, n. (Chem.) A salt of pyrotartaric acid.

Pyrotechnian
Pyr•o•tech´ni•an, n. A pyrotechnist. { Pyr•o•tech´nic, Pyr•o•tech´nic•al } a. [ Pyro- + technic, technical: cf. F. pyrotechnique. See Fire, Technical.] Of or pertaining to fireworks, or the art of forming them. Pyrotechnical sponge. See under Sponge.

Pyrotechnics
Pyr•o•tech´nics, n. The art of making fireworks; the manufacture and use of fireworks; pyrotechny.

Pyrotechnist
Pyr•o•tech´nist, n. One skilled in pyrotechny; one who manufactures fireworks. Steevens.

Pyrotechny
Pyr•o•tech•ny, n. [Cf. F. pyrotechnie.]
1. The use and application of fire in science and the arts. [Obs.] Sir M. Hale.
2. Same as Pyrotechnics.

Pyrotic
Py•rot´ic, a. [Gr., fr. to burn, fr.,, fire: cf. F. pyrotique.] Caustic. See Caustic. — n. (Med.) A caustic medicine.

Pyrotungstic
Pyr•o•tung´stic, a. (Chem.) Polytungstic. See Metatungstic.

Pyroxanthin
Pyr•o•xan´thin, n. [ Pyro- + Gr. yellow.] (Chem.) A yellow crystalline hydrocardon extracted from crude wood spirit; — called also eblanin.

Pyroxene
Pyr´ox•ene, n. [F. pyroxène, from Gr. fire + a stranger; — so called because it was supposed to the be a stranger, or of rare occurrence, in igneous rocks,] (Min.) A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90°, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc. The pyroxene group contains pyroxene proper, also the related orthorhombic species, enstatite, bronzite, hypersthene, and various monoclinic and triclinic species, as rhodonite, etc.

Pyroxenic
Pyr•ox•en´ic, a. [Cf. F. pyroxenique.] Containing pyroxene; composed chiefly of pyroxene.

Pyroxenite
Py•rox´e•nite, n. (Min.) A rock consisting essentially of pyroxene.

Pyroxyle
Py•rox´yle, n. [Cf. F. pyroxyle. See Pyroxylic, -yl.]

Pyroxylin
Py•rox´y•lin, n. (Chem.) A substance resembling gun cotton in composition and properties, but distinct in that it is more highly nitrified and is soluble in alcohol, ether, etc.; — called also pyroxyle.

Pyrrhic
Pyr´rhic, a. [L. pyrrhichius, Gr. belonging to the (sc. ) a kind of war dance.]
1. Of or pertaining to an ancient Greek martial dance. " ye have the pyrrhic dance as yet." Byron.
2. (Pros.) Of or pertaining to a pyrrhic, or to pyrrhics; containing pyrrhic; as a pyrrhic verse.

Pyrrhic
Pyr´rhic, n.
1. [Gr. : cf. F. pyrrhique, fem.] An ancient Greek martial dance, to the accompaniment of the flute, its time being very quick.
2. [L. pyrrhichius (sc. pes), Gr. (sc. ): cf. F. pyrrhique, masc.] (Pros.) A foot consisting of two short syllables.

Pyrrhicist
Pyr´rhi•cist, n. (Gr. Antiq.) One two danced the pyrrhic. { Pyr•rho´ne•an, Pyr•rhon´ic } a. [L. Pyrrhonêus: cf. F. pyrrhonien.] Of or pertaining to pyrrhonism.

Pyrrhonism
Pyr´rho•nism, n. [From Pyrrho, the founder of a school of skeptics in Greece (about 300 b. c.): cf. F. pyrrhonisme.] Skepticism; universal doubt.

Pyrrol
Pyr´rol, n. [Gr. flame-colored (from fire) + L. oleum oil.] (Chem.) A nitrogenous base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, C₄H₅N, having on odor like that of chloroform. It is the nucleus and origin of a large number of derivatives. So called because it colors a splinter of wood moistened with hydrochloric acid a deep red.

Pyrroline
Pyr´ro•line, n. (Chem.) A nitrogenous base, C₄H₇N, obtained as a colorless liquid by the reduction of pyrrol.

Pyrula
Pyr´u•la, n. [NL., fr. L. pyrus a pear.] (Zoöl.) A genus of large marine gastropods. having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

Pyruric
Py•ru´ric, a. Same as Pyroüric.

Pyruvic
Py•ru´vic, a. [ Pyro- + L. uva a grape.] (Chem.) Pertaining to, or designating, an acid (called also pyroracemic acid) obtained, as a liquid having a pungent odor, by the distillation of racemic acid.

Pyruvil
Py•ru´vil, n. (Chem.) A complex nitrogenous compound obtained by heating together pyruvic acid and urea.

Pythagorean
Pyth•a•go´re•an, a. [L. Pythagoreus, Gr. .] Of or pertaining to Pythagoras (a Greek philosopher, born about 582 b. c.), or his philosophy.
"The central thought of the Pythagorean philosophy is the idea of number, the recognition of the numerical and mathematical relations of things." Encyc. Brit.Pythagorean proposition (Geom.), the theorem that the square described upon the hypothenuse of a plane right-angled triangle is equal to the sum of the squares described upon the other two sides. — Pythagorean system (Astron.), the commonly received system of astronomy, first taught by Pythagoras and afterward revived by Copernicus, whence it is also called the Copernican system. — Pythagorean letter. See Y.

Pythagorean
Pyth•a•go´re•an, n. A follower of Pythagoras; one of the school of philosophers founded by Pythagoras.

Pythagoreanism
Pyth•a•go´re•an•ism, n. The doctrines of Pythagoras or the Pythagoreans.
"As a philosophic school Pythagoreanism became extinct in Greece about the middle of the 4th century [B. C.]." Encyc. Brit. { Pyth•a•gor´ic, Pyth•a•gor´ic•al } a. [L. Pythagoricus, Gr. : cf. F. pythagorique.] See Pythagorean, a.

Pythagorize
Py•thag´o•rize, v. i. [ imp. & p. p. Pythagorized p. pr. & vb. n. Pythagorizing ] [Gr. .] To speculate after the manner of Pythagoras.

Pythocenic
Pyth•o•cen´ic, a. [Gr. to rot + origin.] Producing decomposition, as diseases which are supposed to be accompanied or caused by decomposition.

Python
Py´thon, n. [NL., fr. L. Python the serpent slain near Delphi by Apollo, Gr. .]
1. (Zoöl.) Any species of very large snakes of the genus Python, and allied genera, of the family Pythonidae. They are nearly allied to the boas. Called also rock snake. The pythons have small pelvic bones, or anal spurs, two rows of subcaudal scales, and pitted labials. They are found in Africa, Asia, and the East Indies.
2. A diviner by spirits. "[Manasses] observed omens, and appointed pythons." 4 Kings xxi. 6 (Douay version).

Pythoness
Pyth´o•ness, n. [L. pythonissa: cf. F. pythonisse. See Pythian.]
1. (Gr. Antiq.) The priestess who gave oracular answers at Delphi in Greece.
2. Any woman supposed to have a spirit of divination; a sort of witch. Bp. Hall.

Pythonist
Pyth´o•nist, n. A conjurer; a diviner.

Pythonomorpha
Pyth•o•no•mor´pha, n. pl. [NL. See Python, and -morphous.] (Paleon.) Same as Mosasauria.

Pyx, n. [L. pyxis a box, Gr. pyxi•s a box, especially of boxwood, fr. py•xos the box tree or boxwood. See Box a receptacle.] [Written also pix.]
1. (R. C. Ch.) The box, case, vase, or tabernacle, in which the host is reserved.
2. A box used in the British mint as a place of deposit for certain sample coins taken for a trial of the weight and fineness of metal before it is sent from the mint. Mushet.
3. (Naut.) The box in which the compass is suspended; the binnacle. Weale.
4. (Anat.) Same as Pyxis. Pyx cloth (R. C. Ch.), a veil of silk or lace covering the pyx. — Trial of the pyx, the annual testing, in the English mint, of the standard of gold and silver coins. Encyc. Brit.

Pyx, v. t. To test as to weight and fineness, as the coins deposited in the pyx. [Eng.] Mushet.

Pyxidate
Pyx´i•date, a. Having a pyxidium.

Pyxidium
Pyx•id´i•um, n. ; pl. Pyxidia (#). [NL., fr. Gr., dim. a a box. See Pyx.] (Bot.) (a) A pod which divides circularly into an upper and lower half, of which the former acts as a kind of lid, as in the pimpernel and purslane. (b) The theca of mosses.