Erl-king (n.)youdaoicibaDictYouDict[Erl-king 词源字典]
1797, in Scott's translation of Goethe, from German Erl-könig, fiend who haunts the depths of forests in German and Scandinavian poetic mythology, literally "alder-king;" according to OED, Herder's erroneous translation of Danish ellerkonge "king of the elves." Compare German Eller, Erle "alder" (see alder).[Erl-king etymology, Erl-king origin, 英语词源]