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[kruh-stey-shuh n] /krʌˈsteɪ ʃən/
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.
belonging or pertaining to the crustaceans.
Origin of crustacean
1825-35; < New Latin Crustace(a) (neuter plural) hard-shelled ones (see crust, -acea) + -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for crustacean
  • In the meantime, sensors recorded the crustacean's neuronal activity.
  • Once the parasite lands on a crab, it makes its way to a joint in the crustacean's exoskeleton.
  • For crustacean lovers, the menu lists items such as shrimp sandwiches and crab cakes.
  • The blue part of the image is an isopod-a small crustacean.
  • And overfishing of krill, a tiny crustacean that other marine life feed on, threatens the whole eco-system of the region.
  • And the rest of the country is likely to follow suit soon, as the crustacean now appears to be striking out from its bridgehead.
  • The finished piece resembles an ocean-dwelling crustacean with a human torso emerging from its thorax.
  • It's the ultimate collection of crustacean creations.
  • Related to shrimp and crabs, the giant isopod is a deep-sea crustacean that makes its home on the ocean floor.
  • After a dozen years, the crustacean will grow to the size of a tractor tire.
British Dictionary definitions for crustacean


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
of, relating to, or belonging to the Crustacea
Word Origin
C19: from New Latin crūstāceus hard-shelled, from Latin crūsta shell, crust
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
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Word Origin and History for crustacean

1835, from Crustacea the class name. As an adjective, 1858 (earlier was crustaceous, 1640s).

Online Etymology Dictionary, © 2010 Douglas Harper
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crustacean in Science
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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crustacean in Culture
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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