| an unstable organic acid, C3H6S2O, the methyl and ethyl esters of which are colorless, oily liquids with a penetrating odor. |
xan·thic acid  (zān'thĭk)  n. Any of various unstable acids of the form ROC(S)SH, in which R is usually an alkyl radical. [From the yellow color of its salts.] |