cambium

名词 cambium:

1. a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth
2. the inner layer of the periosteum

cam.bi.um

n.（名词）
A lateral meristem in most vascular plants that forms parallel rows of cells resulting in secondary tissues either as secondary growth or as cork.
形成层：大多数导管植物中靠近边缘的分生组织，它形成植物细胞组成的平行的行列，导致产生二次组织、二次增生或长成软木

来源：
Medieval Latin [exchange]
中世纪拉丁语 [交换]
from Late Latin cambore, cambi3re [to exchange]
源自 后期拉丁语 cambore, cambi3re [交换]
[of Celtic origin]
[源于凯尔特语]

【引伸】
cam.bial
adj.（形容词）