healer (n.)youdaoicibaDictYouDict[healer 词源字典]
late Old English, "one who heals," especially "savior, Jesus," agent noun from heal (v.). As "a curative medicine" from late 14c. The usual Old English noun for Jesus as savior was hæland (Middle English healend), a noun use of a present participle, being a rough translation of the name (see Joshua) or of Latin salvator.[healer etymology, healer origin, 英语词源]