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crustacea    
Crustacea \Crus*ta"ce*a\ (kr?s-t?"sh?-?), n. pl. [Neut. pl. of
NL. crustaceus pert. to the crust or shell, from L. crusta
the hard surfsce of a body, rind, shell.] (Zool.)
One of the classes of the arthropods, including lobsters and
crabs; -- so called from the crustlike shell with which they
are covered.
[1913 Webster]

Note: The body usually consists of an anterior part, made up
of the head and thorax combined, called the
cephalothorax, and of a posterior jointed part called
the abdomen, postabdomen, and (improperly) tail. They
breathe by means of gills variously attached to some of
the limbs or to the sides the body, according to the
group. They are divisible into two subclasses,
Entomostraca and Malacostraca, each of which includes
several orders.
[1913 Webster]




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English Dictionary  2005-2009

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