/ Dictionary / Index I isobutane: Meaning and Definition of Find definitions for: i•so•bu•tane Pronunciation: (ī"su-by'tān, -by-tān'), [key] — n. Chem. a colorless, flammable gas, CH, used as a fuel, as a refrigerant, and in the manufacture of gasoline by alkylation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isobront isobutylene 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