procambium

柯林斯英漢雙解大詞典

procambium /prəʊˈkæmbɪəm/

1.N undifferentiated plant tissue, just behind the growing tip in stems and roots, that develops into conducting tissues 前形成層 ^[1] 

embryonic procambium 胚原形成層

procambium cells 原形成層細胞

procambium bundle 原形成層束 ^[1]