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Xanthorhiza

A genus of shrubby ranunculaceous plants of North America, including only the species Xanthorhiza apiifolia, which has roots of a deep yellow color; yellowroot. The bark is intensely bitter, and is sometimes used as a tonic.

Xanthorhoea

A genus of endogenous plants, native to Australia, having a thick, sometimes arborescent, stem, and long grasslike leaves. See Grass tree.

Xanthose

An orange-yellow substance found in pigment spots of certain crabs.

Xanthosis

The yellow discoloration often observed in cancerous tumors.

Xanthous

Yellow; specifically (Ethnol.), of or pertaining to those races of man which have yellowish, red, auburn, or brown hair.

Xanthoxylene

A liquid hydrocarbon of the terpene series extracted from the seeds of a Japanese prickly ash (Xanthoxylum pipertium) as an aromatic oil.

Xanthoxylum

A genus of prickly shrubs or small trees, the bark and rots of which are of a deep yellow color; prickly ash.

Xe

The chemical symbol for the chemical element xenon, having atomic number 54; it is one of the six noble gases.

Xebec

A small three-masted vessel, with projecting bow and stern and convex decks, used in the Mediterranean for transporting merchandise, etc. It carries large square sails, or lateen sails, or both. Xebecs were formerly armed and used by corsairs.

Xeme

An Arctic fork-tailed gull (Xema Sabinii).

Xenarthra

The suborder of mammals including the armadillos, American anteaters, and sloths.

Xenelasia

A Spartan institution which prohibited strangers from residing in Sparta without permission, its object probably being to preserve the national simplicity of manners.

Xenicidae

A natural family of birds comprising the New Zealand wrens, synonymous with Acanthisittidae.

Xenicus

The type genus for the bird family Xenicidae.

Xenium

A present given to a guest or stranger, or to a foreign ambassador.

Xenodochium

A house for the reception of strangers. 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

Reception of strangers; hospitality.

Xenogenesis

Same as Heterogenesis. The fancied production of an organism of one kind by an organism of another.

Xenogenetic

Of or pertaining to xenogenesis; as, the xenogenetic origin of microzymes.

Xenomania

A mania for, or an inordinate attachment to, foreign customs, institutions, manners, fashions, etc.

Xenomi

A suborder of soft-rayed fresh-water fishes of which the blackfish of Alaska (Dallia pectoralis) is the type.

Xenon

A very heavy, inert gaseous element of the noble gas group, 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 -107/ C., and to a solid which melts at -111.9/ C. Symbol Xe (formerly also X); atomic number 54; atomic weight 131.3.

Xenopterygii

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

A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.

Xenyl

The radical characteristic of xenylic compounds.

Xenylic

Pertaining to, derived from, designating, certain amido compounds obtained by reducing certain nitro derivatives of diphenyl.

Xeraphim

An old money of account in Bombay, equal to three fifths of a rupee.

Xeriff

A gold coin formerly current in Egypt and Turkey, of the value of about 9s. 6d., or about $2.30 (ca. 1900); -- also, in Morocco, a ducat.

Xeroderma

Ichthyosis. A skin disease characterized by the presence of numerous small pigmented spots resembling freckles, with which are subsequently mingled spots of atrophied skin.

Xeronic

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

Among the primitive Christians, the living on a diet of dry food in Lent and on other fasts.

Xerophilous

Drought-loving; able withstand the absence or lack of moisture.

Xerophthalmia

An abnormal dryness of the eyeball produced usually by long-continued inflammation and subsequent atrophy of the conjunctiva.

Xerophyllum

A small genus of North American herbs having grasslike basal leaves: squaw grass; sometimes placed in family Melanthiaceae.

xerophyte

A plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte.

xerophytic

Adapted to a xeric (or dry) environment; as, cacti are xerophytic plants; xerophytic adaptations.

Xerox

A copying machine which copies graphic matter by the action of light on an electrically charged photoconductive insulating surface in which the latent image is developed with a resinous powder.

xerox

To copy a printed document on a xerographic device.

xi

The Roman number symbolizing the value eleven. Used after a noun it may symbolize the ordinal number; as, Superbowl XI.

Xian

The capital of the ancient Chinese empire.

xii

The Roman number symbolizing the value twelve; denoting a quantity consisting of 12 items or units. Used after a noun it may symbolize the ordinal number; as, Superbowl XII.

xiii

the Roman number symbolizing the value thirteen. Used after a noun it may symbolize the ordinal number; as, Superbowl XIII.

Xiphias

A genus of fishes comprising the common swordfish.

Xiphidium

A genus of plants of the order Haemodraceae, having two-ranked, sword-shaped leaves.

Xiphioid

Of, pertaining to, or resembling, a cetacean of the genus Xiphius or family Xiphiidae.

Xiphiplastron

The posterior, or fourth, lateral plate in the plastron of turtles; -- called also xiphisternum.

Xiphisternum

The posterior segment, or extremity, of the sternum; -- sometimes called metasternum, ensiform cartilage, ensiform process, or xiphoid process. The xiphiplastron.

Xiphius

A genus of cetaceans having a long, pointed, bony beak, usually two tusklike teeth in the lower jaw, but no teeth in the upper jaw.

Xiphodon

An extinct genus of artiodactylous mammals found in the European Tertiary formations. It had slender legs, didactylous feet, and small canine teeth.

Xiphoid

Like a sword; ensiform. Of or pertaining to the xiphoid process; xiphoidian.

Xiphura

Same as Limuloidea. Called also Xiphosura.

xl

the Roman number symbolizing the value forty.

Xmas

Christmas; -- an abbreviation for the Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland.

XT

An abbreviation for crosstalk, the presence of an unwanted signal via an accidental coupling.

xv

The Roman number symbolizing the value fifteen.

xvi

The Roman number symbolizing the value sixteen.

xvii

The Roman number symbolizing the value seventeen.

xviii

The Roman number symbolizing the value eighteen.

xx

The Roman number representing twenty; denoting a quantity consisting of 20 items or units.

xxi

The Roman number representing twenty-one.

xxii

The Roman number representing twenty-two.

xxiii

The Roman number representing twenty-three.

xxiv

The Roman number representing twenty-four.

xxix

The Roman number representing twenty-nine.

xxv

The Roman number representing twenty-five.

xxvi

The Roman number representing twenty-six.

xxvii

The Roman number representing twenty-seven.

xxviii

The Roman number representing twenty-eight.

xxx

Very obscene or pornographic.

Xylamide

An acid amide derivative of xylic acid, obtained as a white crystalline substance.

Xylan

A gummy substance of the pentosan class, present in woody tissue, and yielding xylose on hydrolysis; wood gum.

Xylanthrax

Wood coal, or charcoal; -- so called in distinction from mineral coal.

Xylaria

The type genus of the natural family Xylariaceae; fungi with perithecia in the upper part of erect black woody stromata.

Xylariaceae

A natural family of fungi characterized by dark brown to back spores.

Xylem

That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloem.

Xylene

Any of a group of three metameric hydrocarbons of the aromatic series, found in coal and wood tar, and so named because found in crude wood spirit. They are colorless, oily, inflammable liquids, C6H4.(CH3)2, being dimethyl benzenes, and are called respectively orthoxylene, metaxylene, and paraxylene. Called also xylol.

Xylenol

Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH.

Xyletic

Pertaining to, or designating, a complex acid related to mesitylenic acid, obtained as a white crystalline substance by the action of sodium and carbon dioxide on crude xylenol.

Xylic

Pertaining to, derived from, or related to, xylene; specifically, designating any one of several metameric acids produced by the partial oxidation of mesitylene and pseudo-cumene.

Xylidic

Pertaining to, or designating, either one of two distinct acids which are derived from xylic acid and related compounds, and are metameric with uvitic acid.

Xylidine

Any one of six metameric hydrocarbons, (CH3)2.C6H3.NH2, resembling aniline, and related to xylene. They are liquids, or easily fusible crystalline substances, of which three are derived from metaxylene, two from orthoxylene, and one from paraxylene. They are called the amido xylenes.

Xylindein

A green or blue pigment produced by Peziza in certain kinds of decayed wood, as the beech, oak, birch, etc., and extracted as an amorphous powder resembling indigo.

Xylite

A liquid hydrocarbon found in crude wood spirits.

Xylitone

A yellow oil having a geraniumlike odor, produced as a side product in making phorone; -- called also xylite oil.

Xylobalsamum

The dried twigs of a Syrian tree (Balsamodendron Gileadense).

Xylocopa

A genus of hymenopterous insects including the carpenter. See Carpenter bee, under Carpenter.

Xylogen

Nascent wood; wood cells in a forming state. Lignin.

Xylograph

An engraving on wood, or the impression from such an engraving; a print by xylography.

Xyloid

Resembling wood; having the nature of wood.

Xyloidin

A substance resembling pyroxylin, obtained by the action of nitric acid on starch; -- called also nitramidin.

Xylology

The branch of dendrology treating of the gross and minute structure of wood.

Xylophaga

A genus of marine bivalves which bore holes in wood. They are allied to Pholas.

Xylophagan

One of a tribe of beetles whose larvae bore or live in wood. Any species of Xylophaga. Any one of the Xylophagides.

Xylophagides

A tribe or family of dipterous flies whose larvae live in decayed wood. Some of the tropical species are very large.

Xylophagous

Eating, boring in, or destroying, wood; -- said especially of certain insect larvae, crustaceans, and mollusks. Of or pertaining to the genus Xylophaga.

Xylophilan

One of a tribe of beetles (Xylophili) whose larvae live on decayed wood.

Xyloplastic

Formed of wood pulp by molds; relating to casts made of wood pulp in molds.

Xylopyrography

The art or practice of burning pictures on wood with a hot iron; -- called also wood burning and poker painting. See Poker picture, under Poker.

Xyloquinone

Any one of a group of quinone compounds obtained respectively by the oxidation of certain xylidine compounds. In general they are yellow crystalline substances.

Xylorcin

A derivative of xylene obtained as a white crystalline substance which on exposure in the air becomes red; -- called also betaorcin.

Xylose

An unfermentable sugar of the pentose class, C5H10O5, formed by the hydrolysis of xylan; wood sugar.

Xylostein

A glucoside found in the poisonous berries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance.

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