[nawt-l-oid] /ˈnɔt lˌɔɪd/

a mollusk of the subclass Nautiloidea, including nautiluses and many fossil species that were abundant in the Ordovician and Silurian periods.
noting or pertaining to a nautiloid.
any mollusc of the Nautiloidea, a group of cephalopods that includes the pearly nautilus and many extinct forms
of, relating to, or belonging to the Nautiloidea
Any of various cephalopod mollusks of the subclass Nautiloidea, having a straight or coiled shell divided internally into a series of chambers of increasing size connected by a central tube. The nautiloids include the modern nautiluses as well as numerous extinct species dating back as far as the Cambrian Period.


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