sea slug

noun
a nudibranch.

Origin:
1770–80

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Collins
World English Dictionary
sea slug
 
n
See nudibranch any of various shell-less marine gastropod molluscs, esp those of the order Nudibranchia

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sea slug  
Any of various colorful marine gastropods of the suborder Nudibranchia, lacking a shell and gills but having fringelike projections that serve as respiratory organs. Also called nudibranch.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
From scallop to sea slug, invertebrates have served as models of human and animal disease.
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