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