plastron (n.)youdaoicibaDictYouDict[plastron 词源字典]
c. 1500, from Middle French plastron "breastplate," from Italian piastrone, augmentative of piastra "breastplate, thin metal plate" (see piaster). As an animal part, from 1813; as an article of dress, 1876.[plastron etymology, plastron origin, 英语词源]