restorative (adj.)youdaoicibaDictYouDict[restorative 词源字典]
late 14c., from Old French restoratif from restorer (see restore).[restorative etymology, restorative origin, 英语词源]
restorative (n.)youdaoicibaDictYouDict
early 15c., from restorative (adj.), or from Medieval Latin restaurativum "a restorative."