/ Dictionary / Index I I-head engine: Meaning and Definition of Find definitions for: I'-head en"gine Pronunciation: (ī'hed"), [key] an internal-combustion engine with both intake and exhaust valves placed directly above the piston. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. IGY IHL Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language