/ Dictionary / Index P perchlorate: Meaning and Definition of Find definitions for: per•chlo•rate Pronunciation: (pur-klôr'āt, -klōr'-), [key] — n. Chem. a salt or ester of perchloric acid, as potassium perchlorate, KClO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: perchlorate (Thesaurus) perching bird perchloric Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language