这个词是什么意思？
Nutritive tissue of the seeds of flowering plants that surrounds the EMBRYOS. It is produced by a parallel process of fertilization in which a second male gamete from the pollen grain fuses with two female nuclei within the embryo sac. The endosperm varies in ploidy and contains reserves of starch, oils, and proteins, making it an important source of human nutrition.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D056625 · MeSH 2026。
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