/ Dictionary / Index N nitrile: Meaning and Definition of Find definitions for: ni•trile Pronunciation: (nī'tril, -trēl, -trīl), [key] — n. Chem. any of a class of organic compounds with the general formula RC≡N. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nitrile (Thesaurus) nitrify nitrile rubber Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language