periderm noun. ['pɛrɪdǝ:m] M19.
[from PERI- + Greek derma skin.]
Botany. The corky layer of a plant stem; spec. a secondary protective tissue, formed from cork cambium and its derivatives, which replaces the epidermis of a stem or root after injury or when it is thickened by secondary growth.

■ peri'dermal adjective L19.

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