单词	periderm
释义	periderm noun peri·​derm ˈper-ə-ˌdərm  : an outer layer of tissue especially : a cortical protective layer of many roots and stems that typically consists of phellem, phellogen, and phelloderm Word History Etymology New Latin peridermis, from peri- + -dermis First Known Use 1849, in the meaning defined above Medical Definition periderm noun peri·​derm ˈper-ə-ˌdərm  : the outer layer of the epidermis of the skin especially of the embryo
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