cotyledon
/ˌkɒtɪˈliːdən/noun
1
- Botany an embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed【植】子叶。
2
- a succulent plant of the stonecrop family, some kinds of which are grown as ornamentals长筒莲（景天科植物, 某些品种供观赏）。
2.1
- Genus Cotyledon and related genera, family Crassulaceae: several species, in particular the South African C. orbiculata and the European wall pennywort.长筒莲属及相关属, 景天科： 数种, 尤指南非的圆叶长筒莲和欧洲的岩生脐景天。
派生词
cotyledonary
adjective词源
mid 16th cent. (denoting a patch of villi on the placenta of mammals)： from Latin, 'navelwort' （which has cup-shaped leaves）, from Greek kotulēdōn 'cup-shaped cavity', from kotulē 'cup'.