/ Dictionary / Index X xanthic acid: Meaning and Definition of Find definitions for: xan'thic ac'id Pronunciation: [key] — Chem. Chem. an unstable organic acid, CHSO, the methyl and ethyl esters of which are colorless, oily liquids with a penetrating odor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. xanthic xanthin Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language