X . 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.
X rays n. pl. Alt. of X-rays
X-ray tube . A vacuum tube suitable for producing Rontgen rays.
X-rays n. pl. The Rontgen rays; -- so called by their discoverer because of their enigmatical character.
Xanthamide n. An amido derivative of xanthic acid obtained as a white crystalline substance, C2H5O.CS.NH2; -- called also xanthogen amide.
Xanthate n. A salt of xanthic; a xanthogenate.
Xanthelasma n. See Xanthoma.
Xanthian a. 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 a. Tending toward a yellow color, or to one of those colors, green being excepted, in which yellow is a constituent, as scarlet, orange, etc.
Xanthic a. Possessing, imparting, or producing a yellow color; as, xanthic acid.
Xanthic a. Of or pertaining to xanthic acid, or its compounds; xanthogenic.
Xanthic a. Of or pertaining to xanthin.
Xanthide n. A compound or derivative of xanthogen.
Xanthidia pl. of Xanthidium
Xanthidium n. A genus of minute unicellular algae of the desmids. These algae 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.