Osanne
O•san´ne, n. Hosanna. [Obs.] Chaucer.

Osar
O´sar, n. pl. (Geol.) See 3d Os.

Oscillancy
Os´cil•lan•cy, n. The state of oscillating; a seesaw kind of motion. [R.]

Oscillaria
Os•cil•la´ri•a, n. [NL., fr. L. oscillare to swing.] (Bot.) A genus of dark green, or purplish black, filamentous, fresh-water algae, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

Oscillate
Os´cil•late, v. i. [ imp. & p. p. Oscillated p. pr. & vb. n. Oscillating ] [L. oscillare to swing, fr. oscillum a swing, a little mask or puppet made to be hung from trees and swing in the wind, prob. orig., a little mouth, a dim. from os mouth. See Oral, and cf. Osculate.]
1. To move backward and forward; to vibrate like a pendulum; to swing; to sway.
2. To vary or fluctuate between fixed limits; to act or move in a fickle or fluctuating manner; to change repeatedly, back and forth.
"The amount of superior families oscillates rather than changes, that is, it fluctuates within fixed limits." Dc Quincey.

Oscillating current
Os"cil•lat•ing current. (Elec.) A current alternating in direction.

Oscillation
Os•cil•la´tion, n. [L. oscillatio a swinging.]
1. The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.
2. Fluctuation; variation; change back and forth.
"His mind oscillated, undoubtedly; but the extreme points of the oscillation were not very remote." Macaulay. Axis of oscillation, Center of oscillation. See under Axis, and Center.

Oscillator
Os´cil•la•tor, n. One that oscillates; specif.: (a) (Elec.) Any device for producing electric oscillations; esp., an apparatus for generating electric waves in a system of wireless telegraphy. (b) (Mech.) An instrument for measuring rigidity by the torsional oscillations of a weighted wire.

Oscillatoria
Os•cil•la•to´ri•a, n. pl. [NL. See Oscillatory.] (Bot.) Same as Oscillaria.

Oscillograph
Os´cil•lo•graph, n. [L. oscillare to swing + -graph.] (Elec.) An apparatus for recording or indicating alternating-current wave forms or other electrical oscillations, usually consisting of a galvanometer with strong field, in which the mass of the moving part is very small and frequency of vibration very high. — Os•cil•lo•graph´ic (#), a.

Oscillometer
Os•cil•lom´e•ter, n. [L. oscillare to swing + -meter.] An instrument for measuring the angle through which a ship rolls or pitches at sea.

Oscilloscope
Os•cil´lo•scope, n. [L. oscillare to swing + -scope.] (Elec.) An instrument for showing visually the changes in a varying current; an oscillograph.

Oscine
Os´cine, a. (Zoöl.) Relating to the Oscines.

Oscines
Os´ci•nes, n. pl. [L. oscen, -inis.] (Zoöl.) Singing birds; a group of the Passeres, having numerous syringeal muscles, conferring musical ability.

Oscinian
Os•cin´i•an, n. (Zoöl.) One of the Oscines, or singing birds.

Oscinian
Os•cin´i•an, n. (Zoöl.) Any one of numerous species of dipterous files of the family Oscinidae. Some, whose larvae live in the stalks, are very destructive to barley, wheat, and rye; others, as the barley fly ( Oscinis frit), destroy the heads of grain.

Oscinine
Os´ci•nine, a. (Zoöl.) Of or pertaining to the Oscines.

Oscitancy
Os´ci•tan•cy, n. [See Oscitant.]
1. The act of gaping or yawning.
2. Drowsiness; dullness; sluggishness. Hallam.
"It might proceed from the oscitancy of transcribers." Addison.

Oscitantly
Os´ci•tant•ly, adv. In an oscitant manner.

Oscitate
Os´ci•tate, v. i. [L. oscitare; os the mouth + citare, v. intens. fr. ciere to move.] To gape; to yawn.

Oscitation
Os•ci•ta´tion, n. [L. oscitatio: cf. F. oscitation.] The act of yawning or gaping. Addison.

Osculant
Os´cu•lant, a. [L. osculans, -antis, p. pr. of osculari to kiss. See Osculate.]
1. Kissing; hence, meeting; clinging.
2. (Zoöl.) Adhering closely; embracing; — applied to certain creeping animals, as caterpillars.
3. (Biol.) Intermediate in character, or on the border, between two genera, groups, families, etc., of animals or plants, and partaking somewhat of the characters of each, thus forming a connecting link; interosculant; as the genera by which two families approximate are called osculant genera.

Osculatory
Os´cu•la•to•ry, a.
1. Of or pertaining to kissing; kissing. "The osculatory ceremony." Thackeray.
2. (Geom.) Pertaining to, or having the properties of, an osculatrix; capable of osculation; as a circle may be osculatory with a curve, at a given point. Osculatory circle. (Geom.) See Osculating circle of a curve, under Circle. — Osculatory plane (to a curve of double curvature), a plane which passes through three successive points of the curve. — Osculatory sphere (to a line of double curvature), a sphere passing through four consecutive points of the curve.

Osculatory
Os´cu•la•to•ry, n. [LL. osculatorium. See Osculate.] (R. C. Ch.) Same as Pax, 2.

Oscule
Os´cule, n. [Cf. F. oscule. See Osculum.] (Zoöl.) One of the excurrent apertures of sponges.

Osiered
O´siered, a. Covered or adorned with osiers; as osiered banks. [Poetic] Collins.

Osiery
O´sier•y, n. An osier bed.

Osiris
O•si´ris, n. [L., fr. Gr. ; of Egyptian origin.] (Myth.) One of the principal divinities of Egypt, the brother and husband of Isis. He was figured as a mummy wearing the royal cap of Upper Egypt, and was symbolized by the sacred bull, called Apis. Cf. Serapis. — O•sir´i•an (#), a.

Osmaterium
Os•ma•te´ri•um, n. ; pl. Osmateria (#). [NL., fr. Gr. smell.] (Zoöl.) One of a pair of scent organs which the larvae of certain butterflies emit from the first body segment, either above or below.

Osmazome
Os´ma•zome, n. [Gr. smell, odor + broth: cf. F. osmazôme.] (Old Chem.) A substance formerly supposed to give to soup and broth their characteristic odor, and probably consisting of one or several of the class of nitrogenous substances which are called extractives.

Osmiamate
Os•mi•am´ate, n. (Chem.) A salt of osmiamic acid.

Osmiamic
Os•mi•am´ic, a. [ Osmium + a. ido.] (Chem.) Of, pertaining to, or designating, a nitrogenous acid of osmium, H₂N₂Os₂O₅, forming a well-known series of yellow salts.

Osmic
Os´mic, a. (Chem.) Pertaining to, derived from, or containing, osmium; specifically, designating those compounds in which it has a valence higher than in other lower compounds; as osmic oxide. Osmic acid. (Chem.) (a) Osmic tetroxide. [Obs.] (b) Osmic acid proper, an acid analogous to sulphuric acid, not known in the free state, but forming a well-known and stable series of salts (osmates), which were formerly improperly called osmites. — Osmic tetroxide (Chem.), a white volatile crystalline substance, OsO₄, the most stable and characteristic of the compounds of osmium. It has a burning taste, and gives off a vapor, which is a powerful irritant poison, violently attacking the eyes, and emitting a strong chlorinelike odor. Formerly improperly called osmic acid.

Osmidrosis
Os•mi•dro´sis, n. [NL., from Gr. smell + to sweat.] (Med.) The secretion of fetid sweat.

Osmious
Os´mi•ous, a. (Chem.) Denoting those compounds of osmium in which the element has a valence relatively lower than in the osmic compounds; as osmious chloride. [Written also osmous.] Osmious acid (Chem.), an acid derived from osmium, analogous to sulphurous acid, and forming unstable salts. It is a brown amorphous substance.

Osmite
Os´mite, n. (Chem.) A salt of osmious acid.

Osmium
Os´mi•um, n. [Gr. a smell, odor, akin to to smell. So named in allusion to the strong chlorinelike odor of osmic tetroxide. See Odor.] (Chem.) A rare metallic element of the platinum group, found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477.

Osmograph
Os´mo•graph, n. [ Osmose + -graph.] (Physics) An instrument for recording the height of the liquid in an endosmometer or for registering osmotic pressures.

Osmometer
Os•mom´e•ter, n. [Gr. impulse + -meter.] (Physics) An instrument for measuring the amount of osmotic action in different liquids.

Osmometry
Os•mom´e•try, n. (Physics) The study of osmose by means of the osmometer.

Osmose
Os´mose, n. [Gr., equiv. to impulse, fr. to push.] (Chemical Physics) (a) The tendency in fluids to mix, or become equably diffused, when in contact. It was first observed between fluids of differing densities, and as taking place through a membrane or an intervening porous structure. The more rapid flow from the thinner to the thicker fluid was then called endosmose, and the opposite, slower current, exosmose. Both are, however, results of the same force. Osmose may be regarded as a form of molecular attraction, allied to that of adhesion. (b) The action produced by this tendency. Electric osmose, or Electric endosmose (Elec.), the transportation of a liquid through a porous septum by the action of an electric current.

Osmosis
Os•mo´sis, n. [NL.] Osmose.

Osmotic
Os•mot´ic, a. Pertaining to, or having the property of, osmose; as osmotic force.

Osmund
Os´mund, n. (Bot.) A fern of the genus Osmunda, or flowering fern. The most remarkable species is the osmund royal, or royal fern ( Osmunda regalis), which grows in wet or boggy places, and has large bipinnate fronds, often with a panicle of capsules at the top. The rootstock contains much starch, and has been used in stiffening linen.

Osnaburg
Os´na•burg, n. A species of coarse linen, originally made in Osnaburg, Germany.

Oso-berry
O´so-ber•ry, n. (Bot.) The small, blueblack, drupelike fruit of the Nuttallia cerasiformis, a shrub of Oregon and California, belonging to the Cherry tribe of Rosaceae.

Osphradium
Os•phra´di•um, n. ; pl. Osphradia (#). [NL., fr. Gr. strong scent, fr. to smell.] (Zoöl.) The olfactory organ of some Mollusca. It is connected with the organ of respiration. { Os´prey, Os´pray }, n. [Through OF. fr. L. ossifraga (orig., the bone breaker); prob. influenced by oripelargus (mountain stork, a kind of eagle, Gr. ); cf. OF. orpres, and F. orfraie. See Ossifrage.] (Zoöl.) The fishhawk.

Ossean
Os´se•an, n. (Zoöl.) A fish having a bony skeleton; a teleost.

Ossein
Os´se•in, n. [L. os bone.] (Physiol. Chem.) The organic basis of bone tissue; the residue after removal of the mineral matters from bone by dilute acid; in embryonic tissue, the substance in which the mineral salts are deposited to form bone; — called also ostein. Chemically it is the same as collagen.

Osselet
Os´se•let, n. [F.]
1. A little bone.
2. (Zoöl.) The internal bone, or shell, of a cuttlefish.

Osseous
Os´se•ous, a. [L. osseus, from os, ossis bone; akin to Gr., Skr. asthi. Cf. Oyster.] Composed of bone; resembling bone; capable of forming bone; bony; ossific.

Ossianic
Os•si•an´ic, a. Of or pertaining to, or characteristic of, Ossian, a legendary Erse or Celtic bard.
"The compositions might be fairly classed as Ossianic." G. Eliot.

Ossicle
Os´si•cle, n. [L. ossiculum, dim. of os, ossis, a bone.]
1. A little bone; as the auditory ossicles in the tympanum of the ear.
2. (Zoöl.) One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes.

Ossiculated
Os•sic´u•la•ted, a. Having small bones.

Ossiculum
Os•sic´u•lum, n. ; pl. Ossicula (#). [L., a little bone.] (Zoöl.) Same as Ossicle.

Ossific
Os•sif´ic, a. [L. os, ossis, bone + facere to make: cf. F. ossifique. See Fact.] Capable of producing bone; having the power to change cartilage or other tissue into bone.

Ossifrage
Os´si•frage, n. [L. ossifraga, ossifragus, osprey, fr. ossifragus bone breaking; os, ossis, a bone + frangere, fractum, to break. See Osseous, Break, and cf. Osprey, Ossifragous.] (Zoöl.) (a) The lammergeir. (b) The young of the sea eagle or bald eagle. [Obs.]

Ossifying
Os´si•fy•ing, a. (Physiol.) Changing into bone; becoming bone; as the ossifying process.

Ossivorous
Os•siv´o•rous, a. [L. os, ossis, bone + vorare to devour: cf. F. ossivore.] Feeding on bones; eating bones; as ossivorous quadrupeds. Derham.

Osspringer
Os´spring•er, n. The osprey. [R.]

Ossuarium
Os•su•a´ri•um, n. [L.] A charnel house; an ossuary. Walpole.

Ossuary
Os´su•a•ry, n. ; pl. -ries (#). [L. ossuarium, fr. ossuarius of or bones, fr. os, ossis, bone: cf. F. ossuaire.] A place where the bones of the dead are deposited; a charnel house. [Obs.] Sir T. Browne.

Ost, n. See Oast.

Ostein
Os´te•in, n. [Gr. bone.] Ossein.

Osteitis
Os•te•i´tis, n. [NL. See Osteo-, and -itis.] (Med.) Inflammation of bone.

Ostensibility
Os•ten•si•bil´i•ty, n. The quality or state of being ostensible.

Ostensible
Os•ten´si•ble, a. [From L. ostensus, p. p. of ostendere to show, prop., to stretch out before; fr. prefix obs- (old form of ob-) + tendere to stretch. See Tend.]
1. Capable of being shown; proper or intended to be shown. [R.] Walpole.
2. Shown; exhibited; declared; avowed; professed; apparent; — often used as opposed to real or actual; as an ostensible reason, motive, or aim. D. Ramsay.

Ostension
Os•ten´sion, n. [L. ostensio a showing: cf. F. ostension. See Ostend.] (Eccl.) The showing of the sacrament on the altar in order that it may receive the adoration of the communicants.

Ostensively
Os•ten´sive•ly, adv. In an ostensive manner. { Os•ten•so´ri•um, Os•ten´so•ry } n. ; pl. L. -soria-sories (#). [NL. ostensorium: cf. F. ostensoir. See Ostensible.] (R. C. Ch.) Same as Monstrance.

Ostentator
Os´ten•ta•tor, n. [L.] One fond of display; a boaster. Sherwood.

Ostentive
Os•ten´tive, a. Ostentatious. [Obs.]

Ostentous
Os•ten´tous, a. Ostentatious. [Obs.] Feltham.

Osteo-
Os´te•o-. A combining form of Gr. a bone.

Osteoblast
Os´te•o•blast, n. [ Osteo- + -blast.] (Anat.) One of the protoplasmic cells which occur in the osteogenetic layer of the periosteum, and from or around which the matrix of the bone is developed; an osteoplast.

Osteoclasis
Os•te•o•cla´sis, n. [NL. See Osteoclast.] (Surg.) The operation of breaking a bone in order to correct deformity.

Osteocolla
Os•te•o•col´la, n. [ Osteo- + Gr. glue.]
1. A kind of glue obtained from bones. Ure.
2. A cellular calc tufa, which in some places forms incrustations on the stems of plants, — formerly supposed to have the quality of uniting fractured bones.

Osteocomma
Os•te•o•com´ma, n. ; pl. L. Osteocommata (#), E. Osteocommas (#). [NL. See Osteo-, and Comma.] (Anat.) A metamere of the vertebrate skeleton; an osteomere; a vertebra. Owen.

Osteocranium
Os•te•o•cra´ni•um, n. [ Osteo- + cranium.] (Anat.) The bony cranium, as distinguished from the cartilaginous cranium.

Osteodentine
Os•te•o•den´tine, n. [ Osteo- + denite.] (Anat.) A hard substance, somewhat like bone, which is sometimes deposited within the pulp cavity of teeth.

Osteogen
Os´te•o•gen, n. [ Osteo- + -gen.] (Physiol.) The soft tissue, or substance, which, in developing bone, ultimately undergoes ossification. { Os•te•o•gen´e•sis, Os•te•og´e•ny } n. [ Osteo- + genesis, or the root of Gr. to be born: cf. F. osteogenie.] (Physiol.) The formation or growth of bone.

Osteogenetic
Os•te•o•ge•net´ic, a. (Physiol.) Connected with osteogenesis, or the formation of bone; producing bone; as osteogenetic tissue; the osteogenetic layer of the periosteum.

Osteogenic
Os•te•o•gen´ic, a. (Physiol.) Osteogenetic.

Osteographer
Os•te•og´ra•pher, n. An osteologist.

Osteography
Os•te•og´ra•phy, n. [ Osteo- + -graphy.] The description of bones; osteology.

Osteoid
Os´te•oid, a. [ Osteo- + - oid: cf. Gr. .] (Anat.) Resembling bone; bonelike.

Osteolite
Os´te•o•lite, n. [ Osteo- + -lite.] (Min.) A massive impure apatite, or calcium phosphate.

Osteologer
Os•te•ol´o•ger, n. One versed in osteology; an osteologist. { Os•te•o•log´ic, Os•te•o•log´ic•al } a. [Cf. F. osteologique.] Of or pertaining to osteology. — Os•te•o•log´ic•al•ly, adv.

Osteologist
Os•te•ol´o•gist, n. One who is skilled in osteology; an osteologer.

Osteology
Os•te•ol´o•gy, n. [ Osteo- + -logy: cf. F. osteologie.] The science which treats of the bones of the vertebrate skeleton.

Osteolysis
Os•te•ol´y•sis, n. [NL. osteo- + Gr. a loosing.] Softening and absorption of bone. — Os•te•o•lyt´ic (#), a.

Osteoma
Os•te•o´ma, n. ; pl. Osteomata (#). [NL. See Osteo-, and - oma.] (Med.) A tumor composed mainly of bone; a tumor of a bone.

Osteomanty
Os´te•o•man•ty, n. [ Osteo- Gr. divination.] Divination by means of bones. [R.]

Osteomere
Os´te•o•mere, n. [ Osteo- + -mere.] (Anat.) An osteocomma. Owen.

Osteopath
Os´te•o•path, n. A practitioner of osteopathy.

Osteopathic
Os•te•o•path´ic, a. (Med.) Of or pertaining to osteopathy. — Os•te•o•path´ic•al•ly (#), adv.

Osteopathist
Os•te•op´a•thist, n. One who practices osteopathy; an osteopath.

Osteopathy
Os•te•op´a•thy, n. [ Osteo- + Gr. suffering.] (Med.) (a) Any disease of the bones. [R.] (b) A system of treatment based on the theory that diseases are chiefly due to deranged mechanism of the bones, nerves, blood vessels, and other tissues, and can be remedied by manipulations of these parts.

Osteoperiostitis
Os•te•o•per•i•os•ti´tis, n. [NL.; osteo- + periosteum + -itis.] (Med.) Inflammation of a bone and its periosteum.

Osteophone
Os´te•o•phone, n. [Gr. bone + voice.] An instrument for transmission of auditory vibrations through the bones of the head, so as to be appreciated as sounds by persons deaf from causes other than those affecting the nervous apparatus of hearing.

Osteoplast
Os´te•o•plast, n. [ Osteo- + Gr. to form.] (Anat.) An osteoblast.

Osteoplastic
Os•te•o•plas´tic, a. [ Osteo- + -plastic.]
1. (Physiol.) Producing bone; as osteoplastic cells.
2. (Med.) Of or pertaining to the replacement of bone; as an osteoplastic operation.

Osteoplasty
Os´te•o•plas•ty, n. [ Osteo- + -plasty.] (Med.) An operation or process by which the total or partial loss of a bone is remedied. Dunglison.

Osteoporosis
Os•te•o•po•ro´sis, n. [NL.; osteo- + Gr. pore.] (Med. & Physiol.) An absorption of bone so that the tissue becomes unusually porous.

Osteopterygious
Os•te•op•ter•yg´i•ous, a. [ Osteo- Gr. a fin.] (Zoöl.) Having bones in the fins, as certain fishes.

Osteosarcoma
Os•te•o•sar•co´ma, n. ; pl. Osteosarcomata (#). [NL. See Osteo-, and sarcoma.] (Med.) A tumor having the structure of a sacroma in which there is a deposit of bone; sarcoma connected with bone.

Osteotome
Os´te•o•tome, n. [ Osteo- + Gr. .] (Surg.) Strong nippers or a chisel for dividing bone.

Osteotomist
Os•te•ot´o•mist, n. One skilled in osteotomy.

Osteotomy
Os•te•ot´o•my, n.
1. The dissection or anatomy of bones; osteology.
2. (Surg.) The operation of dividing a bone or of cutting a piece out of it, — done to remedy deformity, etc.

Osteozoa
Os•te•o•zo´a, n. pl. [NL., fr. Gr. a bone + zo^,on an animal.] (Zoöl.) Same as Vertebrata.

Ostiole
Os´ti•ole, n. [L. ostiolum a little door, dim. of ostium a door: cf. F. ostiole.] (Bot.) (a) The exterior opening of a stomate. See Stomate. (b) Any small orifice.

Ostler
Ost´ler, n. See Hostler.

Ostlery
Ost´ler•y, n. See Hostelry. [Obs.]

Ostracean
Os•tra´cean, n. [L. ostrea an oyster. See Oyster.] (Zoöl.) Any one of a family of bivalves, of which the oyster is the type.

Ostraciont
Os•tra´ci•ont, n. (Zoöl.) A fish of the genus Ostracion and allied genera.

Ostracism
Os´tra•cism, n. [Gr., fr. to ostracize. See Ostracize.]
1. (Gr. Antiq.) Banishment by popular vote, — a means adopted at Athens to rid the city of a person whose talent and influence gave umbrage.
2. Banishment; exclusion; as social ostracism.
"Public envy is as an ostracism, that eclipseth men when they grow too great." Bacon.
"Sentenced to a perpetual ostracism from the … confidence, and honors, and emoluments of his country." A. Hamilton.

Ostracize
Os´tra•cize, v. t. [ imp. & p. p. Ostracized p. pr. & vb. n. Ostracizing ] [Gr., fr. a tile, a tablet used in voting, a shell; cf. oyster, bone. Cf. Osseous, Oyster.]
1. (Gr. Antiq.) To exile by ostracism; to banish by a popular vote, as at Athens. Grote.
2. To banish from society; to put under the ban; to cast out from social, political, or private favor; as he was ostracized by his former friends. Marvell.

Ostracodermi
Os•tra•coder´mi, n. pl. [NL., fr. Gr. shell of a testacean + skin.] (Zoöl.) A suborder of fishes of which Ostracion is the type.

Ostracoid
Os´tra•coid, a. (Zoöl.) Of or pertaining to the Ostracoidea. — n. One of the Ostracoidea.

Ostracoidea
Os•tra•coi´de•a, n. pl. [NL., fr. Gr. shell of a testacean + -oid.] (Zoöl.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about. [Written also Ostracoda.]

Ostrea
Os´tre•a, n. [L., an oyster.] (Zoöl.) A genus of bivalve Mollusca which includes the true oysters.

Ostreaceous
Os•tre•a´ceous, a. [L. ostrea an oyster. See Oyster.] (Zoöl.) Of or pertaining to an oyster, or to a shell; shelly.
"The crustaceous or ostreaceous body." Cudworth.

Ostreophagist
Os•tre•oph´a•gist, n. [Gr. an oyster + to eat.] One who feeds on oysters.

Ostrich
Os´trich, n. [OE. ostriche, ostrice, OF. ostruche, ostruce, F. autruche, L. avis struthio; avis bird + struthio ostrich, fr. Gr., fr. bird, sparrow. Cf. Aviary, Struthious.] [Formerly written also estrich.] (Zoöl.) A large bird of the genus Struthio, of which Struthio camelus of Africa is the best known species. It has long and very strong legs, adapted for rapid running; only two toes; a long neck, nearly bare of feathers; and short wings incapable of flight. The adult male is about eight feet high. The South African ostrich ( Struthio australis) and the Asiatic ostrich are considered distinct species by some authors. Ostriches are now domesticated in South Africa in large numbers for the sake of their plumes. The body of the male is covered with elegant black plumose feathers, while the wings and tail furnish the most valuable white plumes. Ostrich farm, a farm on which ostriches are bred for the sake of their feathers, oil, eggs, etc. — Ostrich farming, the occupation of breeding ostriches for the sake of their feathers, etc. — Ostrich fern (Bot.) a kind of fern ( Onoclea Struthiopteris), the tall fronds of which grow in a circle from the rootstock. It is found in alluvial soil in Europe and North America.

Ostrogoth
Os´tro•goth, n. [L. Ostrogothi, pl. See East, and Goth.] One of the Eastern Goths. See Goth.

Oswego tea
Os•we"go tea" (Bot.) An American aromatic herb ( Monarda didyma), with showy, bright red, labiate flowers.