这个词是什么意思？
A plant family of the order Fagales, subclass Hamamelidae, class Magnoliopsida. They have simple, serrate, alternate leaves. Male flowers are borne in long, pendulous catkins; the female in shorter, pendulous or erect catkins. The fruit is usually a small nut or a short-winged samara.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D029401 · MeSH 2026。
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