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Words starting with x

Word Definition
X 1. X, the twenty-fourth letter of the English alphabet, has three sounds; a compound nonvocal sound (that of ks), as in wax; a compound vocal sound (that of gz), as in example; and, at the beginning of a word, a simple vocal sound (that of z), as in xanthic. See Guide to Pronunciation, // 217, 270, 271.
2. (adj.) being one more than nine
3. (n.) street names for methylenedioxymethamphetamine
4. (n.) the 24th letter of the Roman alphabet
5. (n.) the cardinal number that is the sum of nine and one; the base of the decimal system
X chromosome 1. (n.) the sex chromosome that is present in both sexes: singly in males and doubly in females
X ray 1. (n.) a radiogram made by exposing photographic film to X rays; used in medical diagnosis
2. (n.) electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
x-axis 1. (n.) the horizontal axis in a plane coordinate system
X-linked 1. (adj.) relating to genes or characteristics or conditions carried on the X chromosome
X-linked dominant inheritance 1. (n.) hereditary pattern in which a dominant gene on the X chromosome causes a characteristic to be manifested in the offspring
X-linked gene 1. (n.) a gene located on an X chromosome
X-linked recessive inheritance 1. (n.) 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. (n.) 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 1. (n.) gate for exclusive OR; a circuit in a computer that fires only if only one of its inputs fire
X-radiation 1. (n.) obtaining images by the use of X rays
2. (n.) electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
x-ray 1. (n.) a radiogram made by exposing photographic film to X rays; used in medical diagnosis
2. (n.) electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
3. (v.) take an x-ray of something or somebody
4. (v.) examine by taking x-rays
X-ray diffraction 1. (n.) the scattering of X rays by the atoms of a crystal; the diffraction pattern shows structure of the crystal
X-ray film 1. (n.) photographic film used to make X-ray pictures
X-ray machine 1. (n.) an apparatus that provides a source of X rays
X-ray photograph 1. (n.) a radiogram made by exposing photographic film to X rays; used in medical diagnosis
X-ray photography 1. (n.) radiography that uses X-rays to produce a roentgenogram
X-ray picture 1. (n.) a radiogram made by exposing photographic film to X rays; used in medical diagnosis
X-ray therapy 1. (n.) the therapeutic use of X rays
X-ray tube 1. (n.) 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. (n.) obtaining images by the use of X rays
X-SCID 1. (n.) 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 1. (n.) an antianxiety agent (trade name Xanax) of the benzodiazepine class
xanthamide 1. (n.) An amido derivative of xanthic acid obtained as a white crystalline substance, C2H5O.CS.NH2; -- called also xanthogen amide.
xanthate 1. (n.) A salt of xanthic; a xanthogenate.
2. (n.) a salt or ester of xanthic acid
xanthelasma 1. (n.) See Xanthoma.
2. (n.) xanthoma of the eyelids; occurs chiefly in the elderly
xanthemia 1. (n.) excess carotene in the blood stream; can cause the skin to turn a pale yellow or red color
xanthian 1. (adj.) Of or pertaining to Xanthus, an ancient town on Asia Minor; -- applied especially to certain marbles found near that place, and now in the British Museum.
xanthic 1. (adj.) Tending toward a yellow color, or to one of those colors, green being excepted, in which yellow is a constituent, as scarlet, orange, etc.
2. (adj.) Possessing, imparting, or producing a yellow color; as, xanthic acid.
3. (adj.) Of or pertaining to xanthic acid, or its compounds; xanthogenic.
4. (adj.) Of or pertaining to xanthin.
xanthic acid 1. (n.) any of a class of unstable organic acids containing sulphur