xanthic acid

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various unstable acids of the form ROC(S)SH, in which R is usually an alkyl radical.

Wiktionary

1. n. chemistry any of a class of organic sulphur-containing acids of general formula ROCS2H

GNU Webster's 1913

1. adj. (Chem.) a heavy, astringent, colorless oil, C2H5O.CS.SH, having a pungent odor. It is produced by leading carbon disulphide into a hot alcoholic solution of potassium hydroxide. So called from the yellow color of many of its salts. Called also xanthogenic acid.

WordNet 3.0

1. n. any of a class of unstable organic acids containing sulphur