/ Dictionary / Index G gynecomastia: Meaning and Definition of Find definitions for: gyn•e•co•mas•ti•a Pronunciation: ( jin"i-kō-mas'tē-u, gī"ni-, jī"ni-), [key] — n. abnormal enlargement of the breast in a male. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gynecomastia (Thesaurus) gynecology gynecomorphous Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language