polymorph

Etymology

poly- + -morph

noun

1. (biology) Any organism that shows polymorphism.
2. (chemistry, geology) Any substance or mineral that forms different types of crystal.
3. (transitive, fiction) The transformation of an item or creature into something different by magic.

verb

1. (intransitive) To transform; to change into another form.
2. (fiction, transitive, intransitive) To transform into something different by magic.
   I got hemmed in by the werewolf again and, in desperation, tried an experimental new wand on it; and polymorphed it into a black pudding. 1999, Robin Johnson, “My gnomish healer has been having a rough time of it”, in rec.games.roguelike.nethack (Usenet)