/ Dictionary / Index P polybrominated biphenyl: Meaning and Definition of Find definitions for: pol•y•bro'min•at•ed biphen'yl Pronunciation: (pol"ē-brō'mu-nā"tid), [key] — Chem. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Polybius Polybus Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language