| 单词 | cotyledon | 
| 释义 | Word Frequency cotyledon(ˌkɒtɪˈliːdən) noun 1.  a simple embryonic leaf in seed-bearing plants, which, in some species, forms the first green leaf after germination 2.  a tuft of villi on the mammalian placenta  Derived formscotyledonal (ˌcotyˈledonal) adjective cotyledonary (ˌcotyˈledonary)  adjective cotyledonous (ˌcotyˈledonous) or cotyledonoid (ˌcotyˈledoˌnoid)  adjective Word originC16: from Latin: a plant, navelwort, from Greek  kotulēdōn, from kotulē cup, hollow | 
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