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testa 音标拼音: [t'ɛstə] n. 种皮 种皮 testa n 1: protective outer layer of seeds of flowering plants [synonym: {testa}, {episperm}, {seed coat}] Test \Test\, Testa \Tes"ta\, n.; pl. E. {Tests}, L. {Testae}. [L. testa a piece of burned clay, a broken piece of earthenware, a shell. See {Test} a cupel.] 1. (Zool.) The external hard or firm covering of many invertebrate animals. [1913 Webster] Note: 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. [1913 Webster] 2. (Bot.) The outer integument of a seed; the episperm, or spermoderm. [1913 Webster]
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