/ Dictionary / Index P polybutadiene: Meaning and Definition of Find definitions for: pol•y•bu•ta•di•ene Pronunciation: (pol"ē-by"tu-dī'ēn, -dī-ēn'), [key] — n. Chem. a rubberlike polymer of butadiene blended with other synthetics to replace natural rubber in tires. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Polybus polybutylene Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language