crustacean

[kruh-stey-shuhn]
noun
1.
any chiefly aquatic arthropod of the class Crustacea, typically having the body covered with a hard shell or crust, including the lobsters, shrimps, crabs, barnacles, and wood lice.
adjective
2.
belonging or pertaining to the crustaceans.

Origin:
1825–35; < Neo-Latin Crustace(a) (neuter plural) hard-shelled ones (see crust, -acea) + -an

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
crustacean (krʌˈsteɪʃən)
 
n
1.  any arthropod of the mainly aquatic class Crustacea, typically having a carapace hardened with lime and including the lobsters, crabs, shrimps, woodlice, barnacles, copepods, and water fleas
 
adj
2.  of, relating to, or belonging to the Crustacea
 
[C19: from New Latin crūstāceus hard-shelled, from Latin crūsta shell, crust]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

crustacean
1835, from Mod.L. Crustacea the class name (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
crustacean   (krŭ-stā'shən)  Pronunciation Key 
Any of various widespread arthropods of the class Crustacea that live mostly in water and have a hard shell, a segmented body, and jointed appendages. Crustaceans include crabs, lobsters, shrimp, barnacles, and copepods.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
crustacean [(kru-stay-shuhn)]

A class of arthropods with shells.

Note: Crabs, lobsters, shrimp, and crayfish are crustaceans.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Many insects, and especially certain crustaceans, show us what wonderful
  changes of structure can be effected during development.
Pressurized evolution accounts for the strange crustaceans and tubeworms found
  near thermal vents on the ocean floor.
Our extensive live collection demonstrates natural habitats of many unusual
  insects, arachnids and crustaceans.
Flamingoes, for instance, extract pink pigments from algae and crustaceans they
  filter out of the water.
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