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oaf (n.)

1620s, auf, oph (modern form from 1630s), "a changeling; a foolish child left by the fairies" [Johnson], from a Scandinavian source such as Norwegian alfr "silly person," in Old Norse "elf" (see elf). Hence, "a misbegotten, deformed idiot." Until recently, some dictionaries still gave the plural as oaves.

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