['ә:lkiŋ]
n.
[日尔曼民间传说]妖精之王

Erlking \Erl"king`\, n. [G. erlk["o]nig, fr. Dan. ellekonge
elfking.]
A personification, in German and Scandinavian mythology, of a
spirit or natural power supposed to work mischief and ruin,
esp. to children.