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nautiloid Line breaks: naut¦il|oid
Pronunciation: /ˈnɔːtɪlɔɪd/

Definition of nautiloid in English:


A mollusc of a group of mainly extinct marine molluscs which includes the pearly nautilus.
  • Subclass Nautiloidea, class Cephalopoda: Nautilus is the only surviving genus
Example sentences
  • Ammonoids are descendants of the extinct, primitive coiled nautiloids and they are extinct relatives of modern squid, octopus, cuttlefish, and nautilus.
  • Other fossil groups include diverse rugose corals, some tabulate corals, nautiloids, gastropods, and trilobites.
  • Coiled shells, commonly of ammonoid cephalopods, nautiloids, or gastropods, have been given colloquial names such as rams' horns, snakestones, serpentstones, and conger eels.


Mid 19th century: from the modern Latin genus name Nautilus (see nautilus).

Definition of nautiloid in:
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