Source : Webster's Revised Unabridged Dictionary (1913)

Auf \Auf\ ([add]f), n. [OE. auph, aulf, fr. Icel. [=a]lfr elf.
   See {Elf}.] [Also spelt {oaf}, {ouphe}.]
   A changeling or elf child, -- that is, one left by fairies; a
   deformed or foolish child; a simpleton; an oaf. [Obs.]
   --Drayton.