Word Origin & History

Crustacea
1814, from Mod.L. neut. pl. of crustaceus (animalia) "having a crust or shell," from L. crusta "crust, hard shell" (see crust). Taken as a zoological classification by Lamarck, 1801; Cuvier (1798) had les insectes crustacées.
Online Etymology Dictionary, © 2010 Douglas Harper
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WordNet
crustacea

noun
class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences for crustacea
Zooplankton within the phylum crustacea also have a carapace.
The exact relationships of the crustacea to other taxa are not yet entirely clear.
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