morph, to, v., hacker jargon 1. to change the form or character of; from polymorph, circa 1975. 2. in computer graphics, to use software to combine the characteristics of two or more pixellated images to produce a new image. 3. in gamerese, to change shape. Also metamorph. See polymorph, shapeshifter, lycanthropy. [GJ1]

Addendum: Dictionaries usually give the root of morph as "metamorphose." But people already use "metamorph" as short for metamorphose. Morph is a computer term, and computer geeks are often gamer geeks. I'm pretty sure that morph is short for the D&D term polymorph. [GJ1]