/ Dictionary / Index I isobutyl nitrite: Meaning and Definition of Find definitions for: i'sobu'tyl ni'trite. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isobutylene isobutyl propionate Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language