English Dictionary

cotyledon

/ˌkɒt.ɪˈliː.dən/

noun

(physiology) Each of the patches of villi on the foetal chorion in the placenta of ruminants and some other mammals.

The cotyledon is the first leaf or pair of leaves produced by the embryo of a seed plant.

意味（1）

(physiology) Each of the patches of villi on the foetal chorion in the placenta of ruminants and some other mammals.

Forced to apply animal findings to humans, his human womb also had cotyledons like a dog's.

意味（2）

(botany) The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.