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Xanthamide
An amido derivative of xanthic acid obtained as a white crystalline substance, ; -- called also .
Xanthate
A salt of xanthic; a xanthogenate.
Xanthelasma
See .
Xanthian
Of or pertaining to , an ancient town on Asia Minor; -- applied especially to certain marbles found near that place, and now in the British Museum.
Xanthide
A compound or derivative of xanthogen.
Xanthidium
A genus of minute unicellular alg of the desmids. These alg have a rounded shape and are armed with glochidiate or branched aculei. Several species occur in ditches, and others are found fossil in flint or hornstone.
Xanthin
same as .
Xanthinine
A complex nitrogenous substance related to urea and uric acid, produced as a white powder; -- so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine.
Xanthium
A genus of composite plants in which the scales of the involucre are united so as to form a kind of bur; cocklebur; clotbur.
Xantho-
A combining form from Gr. yellow; as in cobaltic salts. Used also adjectively in chemistry.
Xanthocarpous
Having yellow fruit.
Xanthochroi
A division of the Caucasian races, comprising the lighter-colored members.
Xanthochroic
Having a yellowish or fair complexion; of or pertaining to the Xanthochroi.
Xanthochroid
Having a yellowish or fair complexion.
Xanthochroism
Abnormal coloration of feathers in which yellow replaces the normal color, as in certain parrots. It is commonly due to lack of the dark pigment which with yellow forms green.
Xanthodontous
Having yellow teeth.
Xanthogen
The hypothetical radical supposed to be characteristic of xanthic acid.
Xanthogenate
A salt of xanthic acid.
Xanthogenic
Producing a yellow color or compound; xanthic. See , under .
Xanthoma
A skin disease marked by the development or irregular yellowish patches upon the skin, especially upon the eyelids; -- called also .
Xanthomatous
Of or pertaining to xanthoma.
Xanthomelanous
Of or pertaining to the lighter division of the Melanochroi, or those races having an olive or yellow complexion and black hair.
Xanthophane
The yellow pigment present in the inner segments of the retina in animals. See .
Xanthophyll
A yellow coloring matter found in yellow autumn leaves, and also produced artificially from chlorophyll; -- formerly called also .
Xanthopous
Having a yellow stipe, or stem.
Xanthoproteic
Pertaining to, or derived from, xanthoprotein; showing the characters of xanthoprotein;
Xanthoprotein
A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange-yellow color by the addition of ammonia.
Xanthopuccine
One of three alkaloids found in the root of the yellow puccoon (). It is a yellow crystalline substance, and resembles berberine.
Xanthorhamnin
A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff.
Xanthorhiza
A genus of shrubby ranunculaceous plants of North America, including only the species , which has roots of a deep yellow color; yellowroot. The bark is intensely bitter, and is sometimes used as a tonic.
Xanthorha
A genus of endogenous plants, native to Australia, having a thick, sometimes arborescent, stem, and long grasslike leaves. See .
Xanthose
An orange-yellow substance found in pigment spots of certain crabs.
Xanthospermous
Having yellow seeds.
Xanthous
Yellow; specifically , 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 () as an aromatic oil.
Xebec
A small three-masted vessel, with projecting bow stern and convex decks, used in the Mediterranean for transporting merchandise, etc. It carries large square sails, or both. Xebecs were formerly armed and used by corsairs.
Xeme
An Arctic fork-tailed gull ().
Xenelasia
A Spartan institution which prohibited strangers from residing in Sparta without permission, its object probably being to preserve the national simplicity of manners.
Xenium
A present given to a guest or stranger, or to a foreign ambassador.
Xenodochium
A house for the reception of strangers.
Xenodochy
Reception of strangers; hospitality.
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 and in 1898. It can be condensed to a liquid boiling at -107 C., and to a solid which melts at -111.9 C. Symbol (formely also ); atomic number 54; atomic weight 131.3.
Xenogamy
Cross fertilization.
Xenogenesis
Same as .
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 () is the type.
Xenopterygii
A suborder of fishes including 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.
Xenurine
A cabassou.
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.
Xeres
Sherry. See .
Xerif
A shereef.
Xeriff
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.
Xeroderma
Ichthyosis.
Xeronate
A salt of xeronic acid.
Xeronic
Pertaining to, or designating, an acid, , 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.
Xerophthalmy
Xerophthalmia.
Xiphidium
A genus of plants of the order , having two-ranked, sword-shaped leaves.
Xiphioid
Of, pertaining to, or resembling, a cetacean of the genus or family .
Xiphiplastron
The posterior, or fourth, lateral plate in the plastron of turtles; -- called also .
Xiphisternum
The posterior segment, or extremity, of the sternum; -- sometimes called , , , or .
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.
Xiphoidian
Xiphoid.
Xiphophyllous
Having sword-shaped leaves.
Xiphosura
See .
Xiphura
Same as . Called also .
XP
The first two letters of the Greek word , Christ; -- an abbreviation used with the letters separate or, oftener, in a monogram, often inclosed in a circle, as a symbol or emblem of Christ. It use as an emblem was introduced by Constantine the Great, whence it is known as the , or . See .
x-rated
having a rating of X; not suitable for children; broadly, obscene or sexually explicit.
X-ray astronomy
the branch of astronomy dealing with the study of astronomical objects which emit X-rays, and the methods used to detect such objects.
X-ray tube
A vacuum tube suitable for producing Rntgen rays.
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 .
Xylate
A salt of xylic acid.
Xylem
That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from .
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, , being dimethyl benzenes, and are called respectively , , and . Called also .
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, , 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 .
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 .
Xylo-
A combining form from Gr. wood; as in gen, graph.
Xylobalsamum
The dried twigs of a Syrian tree ().
Xylocarpous
Bearing fruit which becomes hard or woody.
Xylocopa
A genus of hymenopterous insects including the carpenter. See , under .
Xylograph
An engraving on wood, or the impression from such an engraving; a print by xylography.
Xylographer
One who practices 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 .
Xylol
Same as .
Xylology
The branch of dendrology treating of the gross and minute structure of wood.
Xylonite
See .
Xylophaga
A genus of marine bivalves which bore holes in wood. They are allied to Pholas.
Xylophagan
One of a tribe of beetles whose larv bore or live in wood.
Xylophagides
A tribe or family of dipterous flies whose larv live in decayed wood. Some of the tropical species are very large.
Xylophagous
Eating, boring in, or destroying, wood; -- said especially of certain insect larv, crustaceans, and mollusks.
Xylophilan
One of a tribe of beetles () whose larv live on decayed wood.
Xylophilous
Of or pertaining to the xylophilans.
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 . See , under .
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 .
Xylose
An unfermentable sugar of the pentose class, , formed by the hydrolysis of xylan; wood sugar.
Xylostein
A glucoside found in the poisonous berries of a species of honeysuckle (), and extracted as a bitter, white, crystalline substance.
Xylotomist
One versed or engaged in xylotomy.
Xylotomous
Capable of boring or cutting wood; -- said of many insects.
Xylotomy
Art of preparing sections (transverse, tangential, or radial) of wood, esp. by means of a microtome, for microscopic examination.
Xylotrya
A genus of marine bivalves closely allied to Teredo, and equally destructive to timber. One species () is very common on the Atlantic coast of the United States.
Xylyl
Any one of three metameric radicals which are characteristic respectively of the three xylenes.
Xylylene
Any one of three metameric radicals, , derived respectively from the three xylenes. Often used adjectively; .
Xyridaceous
Of or pertaining to a natural order () of endogenous plants, of which Xyris is the type.
Xyris
A genus of endogenous herbs with grassy leaves and small yellow flowers in short, scaly-bracted spikes; yellow-eyed grass. There are about seventeen species in the Atlantic United States.
Xystarch
An office having the superintendence of the xyst.
Xyster
An instrument for scraping bones.