/ Dictionary / Index P peroxyborate: Meaning and Definition of Find definitions for: per•ox•y•bo•rate Pronunciation: (pu-rok"sē-bôr'āt, -it, -bōr'-), [key] — n. Chem. perborate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. peroxyacid peroxydisulfuric acid Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language