nautiloid

[nawt-l-oid]
noun
1.
a mollusk of the subclass Nautiloidea, including nautiluses and many fossil species that were abundant in the Ordovician and Silurian periods.
adjective
2.
noting or pertaining to a nautiloid.
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Collins
World English Dictionary
nautiloid (ˈnɔːtɪˌlɔɪd)
 
n
1.  any mollusc of the Nautiloidea, a group of cephalopods that includes the pearly nautilus and many extinct forms
 
adj
2.  of, relating to, or belonging to the Nautiloidea

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
nautiloid   (nôt'l-oid')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
While brachiopods, crinoids and nautiloid cephalopods declined.
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