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x
1: being one more than nine [syn: {ten}, {10}] n 1: the cardinal number that is the sum of nine and one; the base of the decimal system [syn: {ten}, {10}, {tenner}, {decade}] 2: the 24th letter of the...
X chromosome
1: the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes"
X ray
1: electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target [syn: {X-radiation}, {roentgen ray}] 2: a radiogram made by exposing photographic film to X ra...
x-axis
1: the horizontal axis in a plane coordinate system
X-linked
1: relating to genes or characteristics or conditions carried on the X chromosome; "an X-linked mutation"
X-linked dominant inheritance
1: hereditary pattern in which a dominant gene on the X chromosome causes a characteristic to be manifested in the offspring
X-linked gene
1: a gene located on an X chromosome
X-linked recessive inheritance
1: hereditary pattern in which a recessive gene on the X chromosome results in the manifestation of characteristics in male offspring and a carrier state in female offspring
X-linked SCID
1: SCID in male children resulting from mutation of a gene that codes for a protein on the surface of T cells that allows them to develop a growth factor receptor [syn: {X-SCID}]
X-OR circuit
1: gate for exclusive OR; a circuit in a computer that fires only if only one of its inputs fire [syn: {XOR circuit}, {XOR gate}]
X-radiation
1: electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target [syn: {X ray}, {roentgen ray}] 2: obtaining images by the use of X rays [syn: {X-raying}]
x-ray
1: examine by taking x-rays 2: take an x-ray of something or somebody; "The doctor x-rayed my chest"
X-ray diffraction
1: the scattering of X rays by the atoms of a crystal; the diffraction pattern shows structure of the crystal
X-ray film
1: photographic film used to make X-ray pictures
X-ray machine
1: an apparatus that provides a source of X rays
X-ray photograph
1: a radiogram made by exposing photographic film to X rays; used in medical diagnosis [syn: {roentgenogram}, {X ray}, {X-ray picture}]
X-ray photography
1: radiography that uses X-rays to produce a roentgenogram [syn: {roentgenography}]
X-ray picture
1: a radiogram made by exposing photographic film to X rays; used in medical diagnosis [syn: {roentgenogram}, {X ray}, {X-ray photograph}]
X-ray therapy
1: the therapeutic use of X rays
X-ray tube
1: a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays
X-raying
1: obtaining images by the use of X rays [syn: {X-radiation}]
X-SCID
1: SCID in male children resulting from mutation of a gene that codes for a protein on the surface of T cells that allows them to develop a growth factor receptor [syn: {X-linked SCID}]
Xanax
1: an antianxiety agent (trade name Xanax) of the benzodiazepine class [syn: {alprazolam}]
xanthate
1: a salt or ester of xanthic acid
xanthelasma
1: xanthoma of the eyelids; occurs chiefly in the elderly
xanthemia
1: excess carotene in the blood stream; can cause the skin to turn a pale yellow-red color [syn: {carotenemia}]
xanthic acid
1: any of a class of unstable organic acids containing sulphur
xanthine
1: crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine
Xanthium
1: coarse herbs having small heads of greenish flowers followed by burrs with hooked bristles [syn: {genus Xanthium}]
xanthoma
1: a skin problem marked by the development (on the eyelids and neck and back) of irregular yellow nodules; sometimes attributable to disturbances of cholesterol metabolism
xanthoma disseminatum
1: rare chronic xanthoma of adults n which orange or brownish papules develop on many surfaces of the body
xanthoma multiplex
1: widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism [syn: {xanthomatosis}, {cholesterosis cutis}, {lipid granulomatosis}, {lipoid granulomato...
xanthomatosis
1: widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism [syn: {xanthoma multiplex}, {cholesterosis cutis}, {lipid granulomatosis}, {lipoid granul...
xanthomonad
1: bacteria producing yellow non-water-soluble pigments; some pathogenic for plants
Xanthomonas
1: a genus of bacteria similar to Pseudomonas but producing a yellow pigment that is not soluble in water [syn: {genus Xanthomonas}]
Xanthophyceae
1: yellow-green algae [syn: {class Xanthophyceae}]
xanthophyl
1: yellow carotenoid pigments in plants and animal fats and egg yolks [syn: {xanthophyll}, {lutein}]
xanthophyll
1: yellow carotenoid pigments in plants and animal fats and egg yolks [syn: {xanthophyl}, {lutein}]
xanthopsia
1: visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice
Xanthorrhoeaceae
1: one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted [syn: {family Xanthorrhoeaceae}, {grass tree family}]
Xanthorroea
1: grass trees; sometimes placed in family Xanthorrhoeaceae [syn: {genus Xanthorroea}]
xanthosis
1: an abnormal yellow discoloration of the skin
Xanthosoma
1: tropical American tuberous perennials [syn: {genus Xanthosoma}]
Xanthosoma atrovirens
1: tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes [syn: {yautia}, {tannia}, {spoonflower}, {malanga}, {Xanthosoma sagittifolium}]
Xanthosoma sagittifolium
1: tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes [syn: {yautia}, {tannia}, {spoonflower}, {malanga}, {Xanthosoma atrovirens}]
xanthous
1: similar to the color of an egg yolk [syn: {yellow}, {yellowish}]
Xantusiidae
1: night lizards [syn: {family Xantusiidae}]
Xavier
1: Spanish missionary and Jesuit who establish missionaries in Japan and Ceylon and the East Indies (1506-1552) [syn: {Saint Francis Xavier}]
xc
1: being ten more than eighty [syn: {ninety}, {90}] n : the cardinal number that is the product of ten and nine [syn: {ninety}, {90}]
xci
1: being one more than ninety [syn: {ninety-one}, {91}]
xcii
1: being two more than ninety [syn: {ninety-two}, {92}]
xciii
1: being three more than ninety [syn: {ninety-three}, {93}]
xciv
1: being four more than ninety [syn: {ninety-four}, {94}]
xcl
1: being ten more than one hundred eighty [syn: {one hundred ninety}, {190}]
xcv
1: being five more than ninety [syn: {ninety-five}, {95}]
xcvi
1: being six more than ninety [syn: {ninety-six}, {96}]
xcvii
1: being seven more than ninety [syn: {ninety-seven}, {97}]
xcviii
1: being eight more than ninety [syn: {ninety-eight}, {98}]
Xe
1: a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts [syn: {xenon}, {atomic number 54}]
Xenarthra
1: armadillos; American anteaters; sloths [syn: {suborder Xenarthra}]
Xenicidae
1: alternative names for the family comprising the New Zealand wrens [syn: {family Xenicidae}, {Acanthisittidae}, {family Acanthisittidae}]
Xenicus
1: type genus for the Xenicidae [syn: {genus Xenicus}]
Xenicus gilviventris
1: short-tailed bird resembling a wren [syn: {rock wren}]
xenogenesis
1: the alternation of two or more different forms in the life cycle of a plant or animal [syn: {alternation of generations}, {heterogenesis}]
xenograft
1: tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species [syn: {heterograft}]
xenolith
1: (geology) a piece of rock of different origin from the igneous rock in which it is embedded
xenon
1: a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts [syn: {Xe}, {atomic number 54}]
Xenophanes
1: Greek philosopher (560-478 BC)
xenophobia
1: an irrational fear of foreigners or strangers
xenophobic
1: suffering from xenophobia; having abnormal fear or hatred of the strange or foreign
Xenophon
1: Greek general and historian; student of Socrates (430-355 BC)
Xenopodidae
1: in some classifications the family of the genus Xenopus which is otherwise included in the family Pipidae [syn: {family Xenopodidae}]
Xenopus
1: an African clawed frog; in some classifications made the type genus of a separate family Xenopodidae [syn: {genus Xenopus}]
Xenopus laevis
1: a tongueless frog native to Africa; established in the United States as result of release of laboratory and aquarium animals [syn: {African clawed frog}]
Xenorhyncus
1: East Indian and Australian storks [syn: {genus Xenorhyncus}]
Xenorhyncus asiaticus
1: large mostly white Australian stork [syn: {policeman bird}, {black-necked stork}, {jabiru}]
Xenosauridae
1: monotypic family of Mexican lizards [syn: {family Xenosauridae}]
Xenosaurus
1: type and sole genus of Xenosauridae: slender-bodied Mexican lizards having the upper surface covered with tiny granules and tubercles [syn: {genus Xenosaurus}]
xenotime
1: a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form
xenotransplant
1: a surgical procedure in which tissue or whole organs are transfered from one species to another species [syn: {xenotransplantation}]
xenotransplantation
1: a surgical procedure in which tissue or whole organs are transfered from one species to another species [syn: {xenotransplant}]
xeranthemum
1: any plant of the genus Xeranthemum native to southern Europe having chaffy or silvery flower heads with purplish tubular flowers
Xeranthemum annuum
1: mostly widely cultivated species of everlasting flowers having usually purple flowers; southern Europe to Iran; naturalized elsewhere [syn: {immortelle}]
xeric
1: being deficient in moisture; "deserts provide xeric environments" [ant: {hydric}, {mesic}]
Xerobates
1: possible new genus for desert and Texas tortoises based on recent research [syn: {genus Xerobates}]
xeroderma
1: a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin [syn: {xerodermia}]
xeroderma pigmentosum
1: a rare genetic condition characterized by an eruption of exposed skin occurring in childhood and photosensitivity with severe sunburn; inherited as a recessive autosomal trait in which DNA repair p...
xerodermia
1: a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin [syn: {xeroderma}]
xerographic
1: of or relating to xerography
xerographic copier
1: duplicator that 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 [syn: {Xerox...
xerographic printer
1: a page printer that uses the xerographic process
xerography
1: forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas; "edge enhancement is intrinsi...
xeroma
1: abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A [syn: {xerophthalmia}, {xerophthalmus}, {conjunctivitis arida}]
xerophile
1: plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte [syn: {desert plant}, {xerophyte}, {xerophytic plant}, {xerophilous plant}]
xerophilous plant
1: plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte [syn: {desert plant}, {xerophyte}, {xerophytic plant}, {xerophile}]
xerophthalmia
1: abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A [syn: {xerophthalmus}, {xeroma}, {conjunctivitis arida}]
xerophthalmus
1: abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A [syn: {xerophthalmia}, {xeroma}, {conjunctivitis arida}]
Xerophyllum
1: small genus of North American herbs having grasslike basal leaves: squaw grass; sometimes placed in family Melanthiaceae [syn: {genus Xerophyllum}]
Xerophyllum tenax
1: plant of western North America having woody rhizomes and tufts of stiff grasslike basal leaves and spikes of creamy white flowers [syn: {squaw grass}, {bear grass}]
xerophyte
1: plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte [syn: {desert plant}, {xerophytic plant}, {xerophile}, {xerophilous plant}]
xerophytic
1: adapted to a xeric (or dry) environment; "cacti are xerophytic plants"; "xerophytic adaptations"
xerophytic plant
1: plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte [syn: {desert plant}, {xerophyte}, {xerophile}, {xerophilous plant}]
xeroradiography
1: radiography using X-rays and xerographic (rather than roentgenographic) techniques
xerostomia
1: abnormal dryness of the mouth resulting from decreased secretion of saliva [syn: {dry mouth}]
xerotes
1: the condition of not containing or being covered by a liquid (especially water) [syn: {dryness}, {waterlessness}] [ant: {wetness}]
xerox
1: a copy made by the xerox process [syn: {xerox copy}] 2: duplicator that copies graphic matter by the action of light on an electrically charged photoconductive insulating surface in which the laten...
xerox copy
1: a copy made by the xerox process [syn: {xerox}]
Xerox machine
1: duplicator that 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 [syn: {Xerox...
Xerxes I
1: king of Persia who led a vast army against Greece and won the battle of Thermopylae but was eventually defeated (519-465 BC) [syn: {Xerxes the Great}]
Xerxes the Great
1: king of Persia who led a vast army against Greece and won the battle of Thermopylae but was eventually defeated (519-465 BC) [syn: {Xerxes I}]
Xestobium rufovillosum
1: bores through wood making a ticking sound popularly thought to presage death [syn: {deathwatch beetle}, {deathwatch}]
Xhosa
1: a Bantu language closely related to Zulu
xi
1: being one more than ten [syn: {eleven}, {11}] n 1: the cardinal number that is the sum of ten and one [syn: {eleven}, {11}] 2: the 14th letter of the Greek alphabet
Xian
1: a city of central China; capital of ancient Chinese empire 221-206 BC [syn: {Sian}, {Singan}, {Changan}, {Hsian}]
xii
1: denoting a quantity consisting of 12 items or units [syn: {twelve}, {12}, {dozen}] n : the cardinal number that is the sum of eleven and one [syn: {twelve}, {12}, {dozen}]
xiii
1: being one more than twelve [syn: {thirteen}, {13}] n : the cardinal number that is the sum of twelve and one [syn: {thirteen}, {13}, {baker's dozen}, {long dozen}]
Ximenesia encelioides
1: coarse grayish green annual yellow-flowered herb; southwestern United States to Mexico [syn: {cowpen daisy}, {golden crownbeard}, {golden crown beard}, {butter daisy}, {Verbesina encelioides}]
Xinjiang
1: an autonomous province in far northwestern China on the border with Mongolia and Kazakhstan; the largest province in the People's Republic of China and the homeland of the Uighur people [syn: {Sink...
Xinjiang Uighur Autonomous Region
1: an autonomous province in far northwestern China on the border with Mongolia and Kazakhstan; the largest province in the People's Republic of China and the homeland of the Uighur people [syn: {Xinj...
Xiphias
1: type genus of the Xiphiidae [syn: {genus Xiphias}]
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