Ar*thros"tra*ca\, n. pl. [NL., fr. Gr. 'a`rqron joint + ? a shell.] (Zo["o]l.) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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