/ Dictionary / Index P perboric acid: Meaning and Definition of Find definitions for: per•bo'ric ac'id Pronunciation: (pur-bôr'ik, -bōr'-), [key] — Chem. Chem. a hypothetical acid, HBO, known only in the form of its salts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. perborax Perbunan Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language