cotyledon

名词 cotyledon:

1. embryonic leaf in seed-bearing plants
   同义词：seed leaf

1. Two cotyledons have come out from the seedling.
   小苗长出了两片子叶。

cot.y.le.don

n.（名词）
Botany A leaf of the embryo of a seed plant, which, upon germination either remains in the seed or emerges, enlarges, and becomes green.Also called seed leaf
【植物学】 子叶：种子植物胚的叶片，在萌芽过程中，它或者保持在种子里或者出来，变大并变绿也作 seed leaf
Anatomy One of the lobules constituting the uterine side of the mammalian placenta, consisting mainly of a rounded mass of villi.
【解剖学】 绒毛叶：组成哺乳动物胎盘的子宫边的小叶之一，主要由团装绒毛组成

来源：
Latin [navelwort]
拉丁语 [脐景天]
from Greek kotulôdôn
源自 希腊语 kotulôdôn
from kotulô [hollow object]
源自 kotulô [空心物体]

【引伸】
cot.yle.donal 或
cot.yle.donous