mesosperm

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• Mesosperm — Mes o*sperm, n. [Meso + Gr. ? seed: cf. F. m[ e]sosperme.] (Bot.) A membrane of a seed. See {Secundine}. [1913 Webster] …   The Collaborative International Dictionary of English

• Secundine — Sec un*dine, n. [Cf. F. secondine.] 1. (Bot.) The second coat, or integument, of an ovule, lying within the primine. [1913 Webster] Note: In the ripened seed the primine and secundine are usually united to form the testa, or outer seed coat. When …   The Collaborative International Dictionary of English