3. In medicine, characterized by an atypical form or forms.
4. Differing from the standard form in size or structure: heteromorphic chromosome pairs.
Deviating from the normal, perfect, or mature form; having different forms at different stages of existence, or in different individuals of the same species; applied especially to insects in which there is a wide difference of form between the larva and the adult, and to plants having more than one form of flower.