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  1. a mollusk of the subclass Nautiloidea, including nautiluses and many fossil species that were abundant in the Ordovician and Silurian periods.
  1. noting or pertaining to a nautiloid.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for nautiloid

Historical Examples

  • He referred also to the nautiloid shell of the larva falling to one side.

    Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5


  • The remarkable group of the Trilobites had precedence in order of time of the Nautiloid shell-fishes.

  • Cephalic shield pointed behind; shell internal, chiefly membranous, with calcified nucleus, nautiloid; parapodia forming fins.

British Dictionary definitions for nautiloid


  1. any mollusc of the Nautiloidea, a group of cephalopods that includes the pearly nautilus and many extinct forms
  1. 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

nautiloid in Science


  1. 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.

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