polymorphous (adj.)

"having or exhibiting many or various forms," 1785, from Greek polymorphos "multiform, of many forms, manifold," from polys "many" (from PIE root *pele- (1) "to fill") + morphē "shape, form," a word of uncertain etymology. Especially of insects: "undergoing a series of marked changes during development." Related: Polymorphic; polymorphously; polymorphousness.