‖Tho′ra‐cos″tra‐ca (?), n. pl. [NL. See Thorax, and Ostracoid, a.] (Zoöl.) An extensive division of Crustacea, having a dorsal shield or carapec� ��niting all, or nearly all, of the thoracic somites to the head. It includes the crabs, lobsters, shrimps, and similar species.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.