amphipoda

Amphipoda

Am*phip"o*da\, n. pl. [NL., FR. Gr. ? + ?, ? foot.] (Zo["o]l.) A numerous group of fourteen -- footed Crustacea, inhabiting both fresh and salt water. The body is usually compressed laterally, and the anterior pairs or legs are directed downward and forward, but the posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostraca.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
amphipoda

noun
small flat-bodied semiterrestrial crustaceans: whale lice; sand-hoppers; skeleton shrimp 
WordNet® 3.0, © 2006 by Princeton University.
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