periderm

This term is a specialized botanical descriptor used primarily in plant anatomy and histology. It refers specifically to the secondary protective tissue that develops in woody plants, distinguishing it from the primary epidermis found in younger stems or herbaceous plants.

In a technical context, the periderm is viewed as a complex system comprising three distinct layers: the phellem (cork), the phellogen (cork cambium), and the phelloderm. It is almost exclusively used in academic, scientific, or horticultural discourse rather than general conversation.