x

street names for methylenedioxymethamphetamine ; the 24th letter of the Roman alphabet ; the cardinal number that is the sum of nine and one; the base of the decimal system ;

x-axis

the horizontal axis in a plane coordinate system ;

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 ; electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target ;

x-ray

a radiogram made by exposing photographic film to X rays; used in medical diagnosis ; electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target ;

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 ;

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-raying

obtaining images by the use 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 ;

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 ; electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target ;

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 or 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 ;

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 ;

xanthomatosis

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 ;

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 ;