Definition of neomorph in US English:

neomorph

noun

  • 1Biology. 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.

  • 2Genetics. A mutant allele that produces an effect qualitatively different from that of the wild-type allele.

Origin

Late 19th century. From neo- + -morph. Compare slightly later neomorphism.

Pronunciation

neomorph

/ˈnɪə(ʊ)mɔːf/