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An alphabetical listing of General terms and items. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

X   Street names for methylenedioxymethamphetamine X   The 24th letter of the Roman alphabet X   The cardinal number that is the sum of nine and one; the base of the decimal system X   Being one more than nine X-axis   The horizontal axis in a plane coordinate system X-linked   Relating to genes or characteristics or conditions carried on the X chromosome; "an X-linked mutation" X-linked_dominant_inheritance   Hereditary pattern in which a dominant gene on the X chromosome causes a characteristic to be manifested in the offspring X-linked_gene   A gene located on an X chromosome X-linked_recessive_inheritance   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   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 X-OR_circuit   Gate for exclusive OR; a circuit in a computer that fires only if only one of its inputs fire X-radiation   Obtaining images by the use of X rays X-radiation   Electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target X-ray   Take an x-ray of something or somebody; "The doctor x-rayed my chest" X-ray   Examine by taking x-rays X-raying   Obtaining images by the use of X rays X-ray_diffraction   The scattering of X rays by the atoms of a crystal; the diffraction pattern shows structure of the crystal X-ray_film   Photographic film used to make X-ray pictures X-ray_machine   An apparatus that provides a source of X rays X-ray_photograph   A radiogram made by exposing photographic film to X rays; used in medical diagnosis Back to top X-ray_photography   Radiography that uses X-rays to produce a roentgenogram X-ray_picture   A radiogram made by exposing photographic film to X rays; used in medical diagnosis X-ray_therapy   The therapeutic use of X rays X-ray_tube   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-SCID   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 Xanax   An antianxiety agent (trade name Xanax) of the benzodiazepine class Xanthate   A salt or ester of xanthic acid Xanthelasma   Xanthoma of the eyelids; occurs chiefly in the elderly Xanthemia   Excess carotene in the blood stream; can cause the skin to turn a pale yellow-red color Xanthic_acid   Any of a class of unstable organic acids containing sulphur Xanthine   Crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine Xanthium   Coarse herbs having small heads of greenish flowers followed by burrs with hooked bristles Xanthoma   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 Xanthomatosis   Widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism Xanthoma_disseminatum   Rare chronic xanthoma of adults n which orange or brownish papules develop on many surfaces of the body Xanthoma_multiplex   Widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism Xanthomonad   Bacteria producing yellow non-water-soluble pigments; some pathogenic for plants Xanthomonas   A genus of bacteria similar to Pseudomonas but producing a yellow pigment that is not soluble in water Xanthophyceae   Yellow-green algae Xanthophyl   Yellow carotenoid pigments in plants and animal fats and egg yolks Back to top Xanthophyll   Yellow carotenoid pigments in plants and animal fats and egg yolks Xanthopsia   Visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice Xanthorrhoeaceae   One of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted Xanthorroea   Grass trees; sometimes placed in family Xanthorrhoeaceae Xanthosis   An abnormal yellow discoloration of the skin Xanthosoma   Tropical American tuberous perennials Xanthosoma_atrovirens   Tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes Xanthosoma_sagittifolium   Tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes Xanthous   Similar to the color of an egg yolk Xantusiidae   Night lizards Xavier   Spanish missionary and Jesuit who establish missionaries in Japan and Ceylon and the East Indies (1506-1552) XC   The cardinal number that is the product of ten and nine Xc   Being ten more than eighty Xci   Being one more than ninety Xcii   Being two more than ninety Xciii   Being three more than ninety Xciv   Being four more than ninety Xcl   Being ten more than one hundred eighty Xcv   Being five more than ninety Xcvi   Being six more than ninety Back to top Xcvii   Being seven more than ninety Xcviii   Being eight more than ninety Xe   A colorless odorless inert gaseous element occurring in the earth''s atmosphere in trace amounts Xenarthra   Armadillos; American anteaters; sloths Xenicidae   Alternative names for the family comprising the New Zealand wrens Xenicus   Type genus for the Xenicidae Xenicus_gilviventris   Short-tailed bird resembling a wren Xenogenesis   The alternation of two or more different forms in the life cycle of a plant or animal Xenograft   Tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species Xenolith   (geology) a piece of rock of different origin from the igneous rock in which it is embedded Xenon   A colorless odorless inert gaseous element occurring in the earth''s atmosphere in trace amounts Xenophanes   Greek philosopher (560-478 BC) Xenophobia   An irrational fear of foreigners or strangers Xenophobic   Suffering from xenophobia; having abnormal fear or hatred of the strange or foreign Xenophon   Greek general and historian; student of Socrates (430-355 BC) Xenopodidae   In some classifications the family of the genus Xenopus which is otherwise included in the family Pipidae Xenopus   An African clawed frog; in some classifications made the type genus of a separate family Xenopodidae Xenopus_laevis   A tongueless frog native to Africa; established in the United States as result of release of laboratory and aquarium animals Xenorhyncus   East Indian and Australian storks Xenorhyncus_asiaticus   Large mostly white Australian stork Back to top Xenosauridae   Monotypic family of Mexican lizards Xenosaurus   Type and sole genus of Xenosauridae: slender-bodied Mexican lizards having the upper surface covered with tiny granules and tubercles Xenotime   A brown-to-yellow mineral that is a phosphate of yttrium in crystalline form Xenotransplant   A surgical procedure in which tissue or whole organs are transfered from one species to another species Xenotransplantation   A surgical procedure in which tissue or whole organs are transfered from one species to another species Xeranthemum   Any plant of the genus Xeranthemum native to southern Europe having chaffy or silvery flower heads with purplish tubular flowers Xeranthemum_annuum   Mostly widely cultivated species of everlasting flowers having usually purple flowers; southern Europe to Iran; naturalized elsewhere Xeric   Being deficient in moisture; "deserts provide xeric environments" Xerobates   Possible new genus for desert and Texas tortoises based on recent research Xeroderma   A mild form of ichthyosis characterized by abnormal dryness and roughness of the skin Xeroderma_pigmentosum   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 processesm are defective so they are more likely to chromos Xerodermia   A mild form of ichthyosis characterized by abnormal dryness and roughness of the skin Xerographic   Of or relating to xerography Xerographic_copier   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 Xerographic_printer   A page printer that uses the xerographic process Xerography   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 intrinsic in xerography" Xeroma   Abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A Xerophile   Plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte Xerophilous_plant   Plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte Xerophthalmia   Abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A Back to top Xerophthalmus   Abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A Xerophyllum   Small genus of North American herbs having grasslike basal leaves: squaw grass; sometimes placed in family Melanthiaceae Xerophyllum_tenax   Plant of western North America having woody rhizomes and tufts of stiff grasslike basal leaves and spikes of creamy white flowers Xerophyte   Plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte Xerophytic   Adapted to a xeric (or dry) environment; "cacti are xerophytic plants"; "xerophytic adaptations" Xerophytic_plant   Plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte Xeroradiography   Radiography using X-rays and xerographic (rather than roentgenographic) techniques Xerostomia   Abnormal dryness of the mouth resulting from decreased secretion of saliva Xerotes   The condition of not containing or being covered by a liquid (especially water) Xerox   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 Xerox   A copy made by the xerox process Xerox   Reproduce by xerography Xerox_copy   A copy made by the xerox process Xerox_machine   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 Xerxes_I   King of Persia who led a vast army against Greece and won the battle of Thermopylae but was eventually defeated (519-465 BC) Xerxes_the_Great   King of Persia who led a vast army against Greece and won the battle of Thermopylae but was eventually defeated (519-465 BC) Xestobium_rufovillosum   Bores through wood making a ticking sound popularly thought to presage death Xhosa   A Bantu language closely related to Zulu Xi   The 14th letter of the Greek alphabet XI   The cardinal number that is the sum of ten and one Back to top Xi   Being one more than ten Xian   A city of central China; capital of ancient Chinese empire 221-206 BC XII   The cardinal number that is the sum of eleven and one Xii   Denoting a quantity consisting of 12 items or units XIII   The cardinal number that is the sum of twelve and one Xiii   Being one more than twelve Ximenesia_encelioides   Coarse grayish green annual yellow-flowered herb; southwestern United States to Mexico Xinjiang   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 Xinjiang_Uighur_Autonomous_Region   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 Xiphias   Type genus of the Xiphiidae Xiphias_gladius   Large toothless marine food fish with a long swordlike upper jaw; not completely cold-blooded i.e. they are able to warm their brains and eyes: worldwide in warm waters but feed on cold ocean floor coming to surface at night Xiphiidae   Comprising the common swordfishes Xiphium_iris   Bulbous iris of western Mediterranean region having usually violet-purple flowers Xiphoid_process   Smallest of the three parts of the breastbone; articulates with the corpus sternum and the seventh rib Xiphosura   Horseshoe crabs and extinct forms Xiphosurus_polyphemus   Large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse Xishuangbanna_Dai   A branch of the Tai languages XIV   The cardinal number that is the sum of thirteen and one Xiv   Being one more than thirteen XIX   The cardinal number that is the sum of eighteen and one Back to top Xix   Being one more than eighteen Xizang   An Asian country under the control of China; located in the Himalayas XL   The cardinal number that is the product of ten and four Xl   Being ten more than thirty Xli   Being one more than forty Xlii   Being two more than forty Xliii   Being three more than forty Xliv   Being four more than forty Xlv   Being five more than forty Xlvi   Being six more than forty Xlvii   Being seven more than forty Xlviii   Being eight more than forty Xmas   A Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland XOR_circuit   Gate for exclusive OR; a circuit in a computer that fires only if only one of its inputs fire XOR_gate   Gate for exclusive OR; a circuit in a computer that fires only if only one of its inputs fire Xsgfdsgfd   fgdsgfsgfs XT   The presence of an unwanted signal via an accidental coupling XTC   Street names for methylenedioxymethamphetamine XV   The cardinal number that is the sum of fourteen and one Xv   Being one more than fourteen Back to top XVI   The cardinal number that is the sum of fifteen and one Xvi   Being one more than fifteen XVII   The cardinal number that is the sum of sixteen and one Xvii   Being one more than sixteen XVIII   The cardinal number that is the sum of seventeen and one Xviii   Being one more than seventeen XX   (genetics) normal complement of sex chromosomes in a female XX   The cardinal number that is the sum of nineteen and one Xx   Denoting a quantity consisting of 20 items or units XXI   The cardinal number that is the sum of twenty and one Xxi   Being one more than twenty XXII   The cardinal number that is the sum of twenty-one and one Xxii   Being two more than twenty XXIII   The cardinal number that is the sum of twenty-two and one Xxiii   Being three more than twenty XXIV   The cardinal number that is the sum of twenty-three and one Xxiv   Being four more than twenty XXIX   The cardinal number that is the sum of twenty-eight and one Xxix   Being nine more than twenty XXV   The cardinal number that is the sum of twenty-four and one Back to top Xxv   Being five more than twenty XXVI   The cardinal number that is the sum of twenty-five and one Xxvi   Being six more than twenty XXVII   The cardinal number that is the sum of twenty-six and one Xxvii   Being seven more than twenty XXVIII   The cardinal number that is the sum of twenty-seven and one Xxviii   Being eight more than twenty XXX   (genetics) abnormal complement of three X chromosomes in a female XXX   The cardinal number that is the product of ten and three Xxx   Being ten more than twenty Xxxi   Being one more than thirty Xxxii   Being two more than thirty Xxxiii   Being three more than thirty Xxxiv   Being four more than thirty Xxxv   Being five more than thirty Xxxvi   Being six more than thirty Xxxvii   Being severn more than thirty Xxxviii   Being eight more than thirty XXY   (genetics) abnormal complement of sex hormones in a male resulting in Klinefelter''s syndrome XXY-syndrome   Syndrome in males that is characterized by small testes and long legs and enlarged breasts and reduced sperm production and mental retardation; a genetic defect in which an extra X chromosome (XXY) is present in the male Back to top XY   (genetics) normal complement of sex hormones in a male Xylaria   Type genus of Xylariaceae; fungi with perithecia in the upper part of erect black woody stromata Xylariaceae   Family of fungi characterized by dark brown to back spores Xylaria_mali   Fungus causing black root rot in apples Xylaria_polymorpha   The fruiting bodies of the fungi of the genus Xylaria Xylem   The woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels Xylene   A colorless flammable volatile liquid hydrocarbon used as a solvent Xylocaine   A local anesthetic (trade names Lidocaine and Xylocaine) used topically on the skin and mucous membranes Xylocopa   Carpenter bees Xylol   A colorless flammable volatile liquid hydrocarbon used as a solvent Xylomelum   Small species of Australian trees or shrubs; grown for their fruit and flowers Xylomelum_pyriforme   Tree bearing pear-shaped fruit with a thick woody epicarp Xylophone   A percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets Xylophonist   Someone who plays a xylophone Xylopia   Tropical evergreen trees or shrubs; chiefly African Xylopia_aethiopica   Tropical west African evergreen tree bearing pungent aromatic seeds used as a condiment and in folk medicine Xylose   A sugar extracted from wood or straw; used in foods for diabetics Xylosma   Shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China Xylosma_congestum   Shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China Xyphophorus   Swordtails Back to top Xyphophorus_helleri   Freshwater fish of Central America having a long swordlike tail; popular aquarium fish Xyridaceae   Plants of tropical to temperate regions; usually in wet places Xyridales   An order of monocotyledonous herbs Xyris   Chiefly American marsh plants, having usually yellow flowers Xyris_operculata   Of Australia XYY   (genetics) abnormal complement of sex hormones in a male who has two Y chromosomes X_chromosome   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   A radiogram made by exposing photographic film to X rays; used in medical diagnosis X_ray   Electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target Back to top