gynecomastia (n.)youdaoicibaDictYouDict[gynecomastia 词源字典]
also gynaecomastia, gynecomasty, "condition of a man having breasts like a woman's," 1881, from gyneco- "woman, female" + Latinized form of Greek mazos "breast," variant of mastos (see masto-) + abstract noun ending -ia.[gynecomastia etymology, gynecomastia origin, 英语词源]