/ Dictionary / Index P pyroborate: Meaning and Definition of Find definitions for: py•ro•bo•rate Pronunciation: (pī"ru-bôr'āt, -it, -bōr'-), [key] — n. borax. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyrobitumen pyrocatechol 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