Definition of heteromorph in US English:

heteromorph

noun

Biology
  • See heteromorphic

    • ‘Most heteromorphs form a U-shaped chamber, whereas many normally coiled ammonites inflate or enlarge the terminal body chamber and constrict the aperture.’
    • ‘In the stages A - 3 to AI heteromorphs can be distinguished from tecnomorphs by slightly broader velum in the anteroventral region.’
    • ‘The presence of occasional preadult heteromorphs was mentioned also by Schallreuter, Jones and Meidla.’
    • ‘Ancyloceratina, which contains all other Mesozoic heteromorphs, evolved from Perisphictidae during the Tithonian.’
    • ‘Most heteromorph ammonites have a hooked terminal body chamber.’
    • ‘Size dimorphism, in which the heteromorphs are slightly larger than the tecnomorphs, can be recognized in late instars.’

Pronunciation

heteromorph

/ˈhetərəˌmôrf/