/ Dictionary / Index N nitrile rubber: Meaning and Definition of Find definitions for: ni'trile rub'ber Pronunciation: [key] — Chem. Chem. a synthetic rubber obtained by the copolymerization of acrylonitrile and butadiene, noted for its oil resistance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nitrile nitrite Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language