/ Dictionary / Index P peracid: Meaning and Definition of Find definitions for: per•ac•id Pronunciation: (pur-as'id), [key] — n. Chem. an oxyacid, the primary element of which is in its highest possible oxidation state, as perchloric acid, HClO, and permanganic acid, HMnO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pera peradventure Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language