单词：periderm
[医] 皮上层(胚); 表皮
n. The hard outer covering of hydroids and other marine
animals; the perisarc.
periderm的用法和样例：
例句
- In damaged stems and roots, and in those undergoing secondary growth, it is replaced by a secondary layer, the periderm.已损伤的茎和根，以及进行次生生长的根茎中，表皮被次生层即周皮代替。
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