masto-youdaoicibaDictYouDict[masto- 词源字典]
before vowels mast-, word-forming element meaning "breast," from comb. form of Greek mastos "woman's breast," from madan "to be wet, to flow," from PIE *mad- "wet, moist, dripping" (cognates: Latin madere "be moist;" Albanian mend "suckle;" see mast (n.2)).[masto- etymology, masto- origin, 英语词源]