Definition of "crustacean" [crus•ta•cean]

• Any of various predominantly aquatic arthropods of the class Crustacea, including lobsters, crabs, shrimps, and barnacles, characteristically having a segmented body, a chitinous exoskeleton, and paired, jointed limbs. (noun)
• Of or belonging to the Crustacea. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Okay, it's sorta cute to have "Lobsters" and "Crabs" on the door at Joe's Crab Shack, but which crustacean is more masculine?"
• "Cymothoa exigua, a crustacean, is the only known parasite that effectively replaces a body organ."
• "The independence of a living thing like a human being or a crustacean is a product of the imagination."