cotyledon

/kot-l-eed-n/US // ˌkɒt lˈid n //UK // (ˌkɒtɪˈliːdən) //

子叶,子叶子,子房,子午线

Definitions

n.名词 noun

1
Botany.
- : the primary or rudimentary leaf of the embryo of seed plants.
- : Anatomy. any of several lobules of the placenta.

The term monocotyledon is applied to these plants because the embryo has only one cotyledon or seed-leaf.
A bristle was gummed to one cotyledon, and beyond it a triangular bit of card was fixed, and in front a vertical glass.
Within the cotyledon will be found a little growing shoot pointed toward the top of the kernel.
In Wheat and Oats the cotyledon can be easily seen in the largest seedlings by pulling off the dry husk of the grain.
Closely applied to one side of this, so closely that it is difficult to separate it perfectly, is the single cotyledon.