crustacean

crustacean

(krŭ-stā′shən)

n.

Any of various predominantly aquatic arthropods of the subphylum (or class) Crustacea, including lobsters, crabs, shrimps, and barnacles, characteristically having a segmented body, a chitinous exoskeleton, paired jointed limbs, and two pairs of antennae.

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crus·ta′cean adj.

The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

crustacean

a member of the class Crustacea in the phylum Arthropoda. The class includes shrimps, lobsters, crabs and water fleas. Most forms are aquatic, although a few are terrestrial, living in damp places, e.g. woodlice.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005