Xeme (zem), n. (Zoöl.) An Arctic fork-tailed gull ( Xema Sabinii).

Xenelasia
Xen•e•la´si•a, n. [NL., from Gr. xenhlasi•a expulsion of strangers.] (Gr. Antiq.) A Spartan institution which prohibited strangers from residing in Sparta without permission, its object probably being to preserve the national simplicity of manners.

Xenium
Xe´ni•um, n. ; pl. Xenia (#). [L., from Gr. xe•nion gift to a guest, fr. xe•nos guest.] (Class. Antiq.) A present given to a guest or stranger, or to a foreign ambassador.

Xenodochium
Xen•o•do•chi´um, n. [LL., fr. L. xenodochium a building for the reception of strangers, Gr. .] (a) (Class. Antiq.) A house for the reception of strangers. (b) In the Middle Ages, a room in a monastery for the reception and entertainment of strangers and pilgrims, and for the relief of paupers. [Called also Xenodocheion.]

Xenodochy
Xe•nod´o•chy, n. [Gr. .] Reception of strangers; hospitality. [R.]

Xenogamy
Xe•nog´a•my, n. [Gr. xe•nos strange, foreign + marriage.] (Bot.) Cross fertilization.

Xenogenesis
Xen•o•gen´e•sis, n. [Gr. xe•nos a stranger + E. genesis.] (Biol.) (a) Same as Heterogenesis. (b) The fancied production of an organism of one kind by an organism of another. Huxley.

Xenomania
Xen•o•ma´ni•a, n. [Gr. xe•nos strange + E. mania.] A mania for, or an inordinate attachment to, foreign customs, institutions, manners, fashions, etc. [R.] Saintsbury.

Xenomi
Xen´o•mi, n. pl. [NL., from Gr. xe•nos strange.] (Zoöl.) A suborder of soft-rayed fresh-water fishes of which the blackfish of Alaska ( Dallia pectoralis) is the type.

Xenon
Xen´on, n. [Gr., neut. of strange.] (Chem.) A very heavy, inert gaseous element occurring in the atmosphere in the proportion of one volume is about 20 millions. It was discovered by Ramsay and Travers in 1898. It can be condensed to a liquid boiling at -109° C., and to a solid which volatilizes without melting. Symbol Xe or X; atomic weight 130.2.

Xenopterygii
Xe•nop•te•ryg´i•i, n. pl. [NL., from Gr. xe•nos strange +, dim. of a wing.] (Zoöl.) A suborder of fishes including Gobiesox and allied genera. These fishes have soft-rayed fins, and a ventral sucker supported in front by the pectoral fins. They are destitute of scales.

Xenotime
Xen´o•time, n. [Gr. honoring guests or strangers; xe•nos guest, stranger + honor: cf. G. xenotim.] (Min.) A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.

Xenurine
Xe•nu´rine, n. [Gr. xe•nos strange + tail.] (Zoöl.) A cabassou.

Xenyl
Xen´yl, n. [Gr. xe•nos strange + -yl.] (Chem.) The radical characteristic of xenylic compounds.

Xenylic
Xe•nyl´ic, a. (Chem.) Pertaining to, derived from, designating, certain amido compounds obtained by reducing certain nitro derivatives of diphenyl.

Xeraphim
Xer´a•phim, n. [Pg. xarafin, xerafin, fr. Ar. ashrafi noble, the name of a gold coin.] An old money of account in Bombay, equal to three fifths of a rupee.

Xeres
Xer´es, n. Sherry. See Sherry.

Xeriff
Xer´iff, n. [See Shereef.] A gold coin formerly current in Egypt and Turkey, of the value of about 9s. 6d., or about $2.30; — also in Morocco, a ducat.

Xeronate
Xe´ro•nate, n. (Chem.) A salt of xeronic acid.

Xeronic
Xe•ron´ic, a. [Gr. dry + citra conic.] (Chem.) Pertaining to, or designating, an acid, C₈H₁₂O₄, related to fumaric acid, and obtained from citraconic acid as an oily substance having a bittersweet taste; — so called from its tendency to form its anhydride.

Xerophagy
Xe•roph´a•gy, n. [L. xerophagia, Gr. ; dry + to eat.] Among the primitive Christians, the living on a diet of dry food in Lent and on other fasts.

Xerophilous
Xe•roph´i•lous, a. [Gr. dry + to love.] (Bot.) Drought-loving; able withstand the absence or lack of moisture.
"Plants which are peculiarly adapted to dry climates are termed by De Candolle xerophilous." Goodale.

Xerophthalmia
Xe•roph•thal´mi•a, n. [L., fr. Gr. ; dry + the eye. See Ophthalmia.] (Med.) An abnormal dryness of the eyeball produced usually by long- continued inflammation and subsequent atrophy of the conjunctiva.