[ 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 Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for crustacean

British Dictionary definitions for crustacean

/ (krʌˈsteɪʃən) /


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

adjective Also: crustaceous

of, relating to, or belonging to the Crustacea

Word Origin for crustacean

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

Scientific definitions for crustacean

[ krŭ-stāshən ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for crustacean

[ (kru-stay-shuhn) ]

A class of arthropods with shells.

notes for crustacean

Crabs, lobsters, shrimp, and crayfish are crustaceans.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.