/ Dictionary / Index D diesel: Meaning and Definition of Find definitions for: die•sel Pronunciation: (dē'zul, -sul), [key] —n. See a vehicle powered by a diesel engine. See Die•sel Pronunciation: (dē'zul, -sul), [key] 1858–1913, German automotive engineer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diesel (Thesaurus) Dies Committee diesel cycle Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language