heteromorphic, heteromorphous, heteromorphy 1. In biology, having a different appearance; differing in shape, size, or structure; such as, heteromorphic sex chromosomes. 2. In biology, taking different forms at different stages of a life cycle. 3. In medicine, characterized by an atypical form or forms. 4. Differing from the standard form in si... Found on http://www.wordinfo.info/words/index/info/view_unit/1336/4