(grammar, linguistics) A recurrent distinctive sound or sequence of sounds representing an indivisible morphological form; especially as representing a morpheme.

(linguistics) An allomorph: one of a set of realizations that a morpheme can have in different contexts.

(zoology) A variety of a species, distinguishable from other individuals of the species by morphology or behaviour.

A computer-generated gradual change from one image to another.

(slang) morphine

(colloquial, transitive, intransitive, computer graphics) To change shape, from one form to another, through computer animation.

(science fiction, fantasy) To shapeshift.

(by extension) To undergo dramatic change in a seamless and barely noticeable fashion.