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episperm n. 外種皮 外種皮 episperm n 1: protective outer layer of seeds of flowering plants [synonym: {testa}, {episperm}, {seed coat}] Episperm \Ep"i*sperm\, n. [Pref. epi- Gr. ? seed: cf. F.
['e]pisperme.] (Bot.) The skin or coat of a seed, especially the outer coat. See {Testa}. [1913 Webster]
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