polymorph noun 3verb 2forms 3 noun3 •Any organism that shows polymorphism. •Any substance or mineral that forms different types of crystal. •The transformation of an item or creature into something different by magic. verb2 •To transform; to change into another form. •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 formspolymorphed · polymorphing · polymorphs