X (ks). 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.
The form and value of X are from the Latin X, which is from the Greek , which in some Greek alphabets had the value of ks, though in the one now in common use it represents an aspirated sound of k.
Xanth*am"ide (?), n. [Xanthic + amide.] (Chem.) An amido derivative of xanthic acid obtained as a white crystalline substance, C2H5O.CS.NH2; -- called also xanthogen amide.
Xan"thate (?), n. [See Xanthic.] (Chem.) A salt of xanthic; a xanthogenate.
||Xan`the*las"ma (?), n. [NL.; Gr. xanqo`s yellow + 'e`lasma a metal plate.] (Med.) See Xanthoma.
Xan"thi*an (?), 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.