[], (Noun)

Definitions:
- An anatomical structure or feature that has arisen during phylogeny as a new development, rather than by derivation from earlier features; a structure that does not have a homologue in earlier forms.

- A mutant allele that produces an effect qualitatively different from that of the wild-type allele.


Phrases:

Origin:
late 19th century. From neo- + -morph