calyptrogen
英 [kə'lɪptrədʒən]
美 [kə'lɪptrədʒən]
词性
名词
基本解释
n.根冠细胞层
网络释义
a protective covering, such as a cap or sheath, for the growing point of a plant, typically found in some gymnosperms and dicotyledons.
例证
The calyptrogen of the tree helps to shield the delicate shoot from external damage during its early growth stages.