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Test (), Tes"ta ()} n.; pl. E. Tests (), L. Test (). [L. testa a piece of burned clay, a broken piece of earthenware, a shell. See Test a cupel.] 1. (Zol.) The external hard or firm covering of many invertebrate animals. The test of crustaceans and insects is composed largely of chitin; in mollusks it is composed chiefly of calcium carbonate, and is called the shell. 2. (Bot.) The outer integument of a seed; the episperm, or spermoderm.
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