derma (n.)youdaoicibaDictYouDict[derma 词源字典]
"skin beneath the epidermis," 1706, from Modern Latin derma, from Greek derma (genitive dermatos) "skin," from PIE root *der- (2) "to split, peel, flay" (see tear (v.1)).[derma etymology, derma origin, 英语词源]