dictionary definition:
a. Any of various small, chiefly marine decapod crustaceans of the suborder Natantia, many species of which are edible, having a compressed or elongated body with a well-developed abdomen, long legs and antennae, and a long spinelike projection of the carapace.
b. Any of various similar crustaceans, such as certain isopods and amphipods.
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