/ Dictionary / Index D diolefin: Meaning and Definition of Find definitions for: di•o•le•fin Pronunciation: (dī-ō'lu-fin), [key] — n. Chem. diene. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diol Diomede Islands Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language