[ nawt-l-oid ]

  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.

Origin of nautiloid

First recorded in 1720–30; nautil(us) + -oid

Words Nearby nautiloid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use nautiloid in a sentence

British Dictionary definitions for nautiloid


/ (ˈnɔːtɪˌlɔɪd) /

  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

Scientific definitions for nautiloid


[ nôtl-oid′ ]

  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.