GYNAECOMASTIA Meaning of GYNAECOMASTIA in English [ ˌgʌɪnɪkə(ʊ)'mastɪə , gʌɪ'ni:kə(ʊ)- , dʒ- ]( US gynecomastia ) ■ noun Medicine enlargement of a man's breasts, due to hormone imbalance or hormone therapy. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004