any mollusk of the class Gastropoda, comprising the snails, whelks, slugs, etc.
Also, gastropodous [ga-strop-uh-duhs] . belonging or pertaining to the gastropods.

1820–30; < Neo-Latin Gast(e)ropoda a class of mollusks. See gastro-, -pod Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gastropod or gasteropod (ˈɡæstrəˌpɒd)
1.  any mollusc of the class Gastropoda, typically having a flattened muscular foot for locomotion and a head that bears stalked eyes. The class includes the snails, whelks, limpets, and slugs
2.  of, relating to, or belonging to the Gastropoda
gasteropod or gasteropod
gastropodan or gasteropod
adj, —n
gas'tropodous or gasteropod

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1826, gasteropod, from Gk. gaster (gen. gastros) "stomach" + pous (gen. podos) "foot" (see foot). From the ventral position of the mollusk's "foot."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
gastropod   (gās'trə-pŏd')  Pronunciation Key 
Any of various carnivorous or herbivorous mollusks of the class Gastropoda, having a head with eyes and feelers and a muscular foot on the underside of its body with which it moves. Most gastropods are aquatic, but some have adapted to life on land. Gastropods include snails, which have a coiled shell, and slugs, which have a greatly reduced shell or none at all.

Our Living Language  : Snails, conchs, whelks, and many other similar animals with shells are all called gastropods by scientists. The word gastropod comes from Greek and means "stomach foot," a name that owes its existence to the unusual anatomy of snails. Snails have a broad flat muscular "foot" used for support and for forward movement. This foot runs along the underside of the animal—essentially along its belly. The Greek elements gastro-, "stomach," and -pod, "foot," are found in many other scientific names, such as gastritis (an inflammation of the stomach) and sauropod ("lizard foot," a type of dinosaur).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Otherwise, the fish it preys on would swim away to die, and the slow-moving
  gastropod would have nothing for its efforts.
To protect its soft abdomen, each crab carries its house around, usually an
  abandoned gastropod shell.
Protection mechanisms of the iron-plated armor of a deep-sea hydrothermal vent
So, if you've harbored a secret desire to paint an intimate portrait of a
  gastropod, now is your big chance.
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