/ Dictionary / Index O orthoformic acid: Meaning and Definition of Find definitions for: or'tho•for'mic ac'id Pronunciation: (ôr'thu-fôr'mik, ôr"thu-), [key] — Chem. Chem. a hypothetical acid, HC(OH), known only in the form of its esters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthoformate orthogenesis Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language