ammonoid

English

Etymology

From the scientific name Ammonoidea.

Noun

ammonoid (plural ammonoids)

1. An extinct cephalopod of the subclass Ammonoidea (including ammonites).
   • 2017, Mark Carnall, The Guardian, 9 August:

     Although the extinct externally shelled cephalopods ammonoids have an extensive fossil record, their soft tissues are very poorly known and, like extinct and living nautiloids, they are largely presumed to not have possessed an ink sac.

Adjective

ammonoid (comparative more ammonoid, superlative most ammonoid)

1. Characteristic of an ammonite