/ Dictionary / Index O orthoformate: Meaning and Definition of Find definitions for: or•tho•for•mate Pronunciation: (ôr"thu-fôr'māt), [key] — n. Chem. an ester of orthoformic acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthoepy orthoformic acid Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language