/ Dictionary / Index A arsenous acid: Meaning and Definition of Find definitions for: ar'senous ac'id Pronunciation: [key] — Chem. Chem. a hypothetical acid, HAsO or HAsO, found only in solution or in the form of its salts. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arsenous ars est celare artem* Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language