/ Dictionary / Index H hot-bulb engine: Meaning and Definition of Find definitions for: hot'-bulb' en"gine Pronunciation: (hot'bulb'), [key] a low-compression oil engine requiring a heated bulb or cap for ignition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hotbox hot buttered rum Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language