/ Dictionary / Index H heavy chain: Meaning and Definition of Find definitions for: heav'y chain' Pronunciation: [key] — Immunol. Immunol. either of an identical pair of-shaped polypeptides that, together with the light chains, constitute the antibody molecule. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heavy bomber heavy cream Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language