这个词是什么意思？
A part of the embryo in a seed plant. The number of cotyledons is an important feature in classifying plants. In seeds without an endosperm, they store food which is used in germination. In some plants, they emerge above the soil surface and become the first photosynthetic leaves. (From Concise Dictionary of Biology, 1990)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018548 · MeSH 2026。
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