nautiloid

[ nawt-l-oid ]
/ ˈnɔt lˌɔɪd /

noun

a mollusk of the subclass Nautiloidea, including nautiluses and many fossil species that were abundant in the Ordovician and Silurian periods.

adjective

noting or pertaining to a nautiloid.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for nautiloid

nautiloid

/ (ˈnɔːtɪˌlɔɪd) /

noun

any mollusc of the Nautiloidea, a group of cephalopods that includes the pearly nautilus and many extinct forms

adjective

of, relating to, or belonging to the Nautiloidea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for nautiloid

nautiloid

[ nôtl-oid′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.