| 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 forms cotyledonal (ˌcotyˈledonal) adjective cotyledonary (ˌcotyˈledonary) adjective cotyledonous (ˌcotyˈledonous) or cotyledonoid (ˌcotyˈledoˌnoid) adjective Word origin C16: from Latin: a plant, navelwort, from Greek kotulēdōn, from kotulē cup, hollow |
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