sea slug

sea slug

noun
a nudibranch.

Origin:
1770–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sea slug is always a great word to know.
So is ninnyhammer. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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