/ Dictionary / Index H heteroatom: Meaning and Definition of Find definitions for: het•er•o•at•om Pronunciation: (het"u-rō-at'um), [key] — n. Chem. an atom other than carbon in the ring structure of a heterocyclic compound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heteroaromatic heteroauxin Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language