/ Dictionary / Index H HY antigen: Meaning and Definition of Find definitions for: HY antigen Pronunciation: (āch'wī'), [key] — Immunol. Immunol. an antigen encoded by a gene on the Y (male) chromosome, active in the development of male structures. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hyannis Port Hyattsville Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language