/ Dictionary / Index H Hesselman engine: Meaning and Definition of Find definitions for: Hes'sel•man en"gine Pronunciation: (hes'ul-mun), [key] a low-compression oil engine requiring a spark for ignition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hesse Hesse-Nassau Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language