‖Ar‐thros″tra‐ca, n. pl. [NL., fr. Gr. ἄρθρον joint + � a shell.] (Zoöl.) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.