Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.
  • adj. Of or belonging to the Crustacea.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any arthropod of the subphylum Crustacea, including lobsters, crabs, shrimp, barnacles and woodlice.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to the Crustacea; crustaceous.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to the Crustacea.
  • n. One of the Crustacea.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton
  • adj. of or belonging to the class Crustacea

Etymologies

From New Latin Crūstācea, class name, neuter pl. of crūstāceus, hard-shelled, from Latin crūsta, shell; see kreus- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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