periderm

per.i.derm

n.（名词）
The outer layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it, such as cork.
周皮：木质根或干的外层组织，包括软木形成层和形成层的产物，如软木

【引伸】
per.ider.mal 或
per.ider.mic
adj.（形容词）