Polymorphosis :: Polymorphosis (n.) The assumption of several structural forms without a corresponding difference in function; -- said of sponges, etc..
Polymorphous :: Polymorphous (a.) Having, or assuming, a variety of forms, characters, or styles; as, a polymorphous author..
Polymorphous :: Polymorphous (a.) Having, or occurring in, several distinct forms; -- opposed to monomorphic..