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cotyledon n. 子葉,瓦松屬 子葉,瓦松屬 cotyledon n 1: embryonic leaf in seed-bearing plants [synonym: {cotyledon}, {seed leaf}] Cotyledon \Cot`y*le"don\ (k?t`?-l?"d?n), n. [Gr.??? a cupshaped
hollow, fr. ???. See {Cotyle}.] 1. (Anat.) One of the patches of villi found in some forms of placenta. [1913 Webster] 2. (Bot.) A leaf borne by the caulicle or radicle of an embryo; a seed leaf. [1913 Webster] Note: Many plants, as the bean and the maple, have two cotyledons, the grasses only one, and pines have several. In one African plant ({Welwitschia}) the cotyledons are permanent and grow to immense proportions. [1913 Webster]
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