gynecomastia

ˌɡʌɪnɪkə(ʊ)ˈmastɪə
ɡʌɪˈniːkə(ʊ)mastɪə
dʒʌɪnɪkə(ʊ)ˈmastɪə

noun

enlargement of a man’s breasts, usually due to hormone imbalance or hormone therapy.