/ Dictionary / Index A arsenic acid: Meaning and Definition of Find definitions for: arsen'ic ac'id Pronunciation: [key] — Chem. Chem. a white, crystalline, water-soluble powder, HAsO&multiplydot;HO, used chiefly in the manufacture of arsenates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arsenic arsenical 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