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1. Oxford Dictionary

   cotyledon

   • IPA[ˌkɒtɪˈliːdn]

   英式

   • n.
     an embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed.；a succulent plant of the stonecrop family, some kinds of which are grown as ornamentals.

   • noun: cotyledon, plural noun: cotyledons

2. • 更多解釋

   cotyledon

   • IPA[ˌkädəˈlēd(ə)n]

   美式

   • n.
     an embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear ...

   Oxford American Dictionary