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epidermis
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leaf epidermis
leaf epidermis Micrograph of leaf epidermis (magnified 40x).

epidermis

plant tissue
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epidermis, in botany, outermost, protoderm-derived layer of cells covering the stem, root, leaf, flower, fruit, and seed parts of a plant. The epidermis and its waxy cuticle provide a protective barrier against mechanical injury, water loss, and infection. Various modified epidermal cells regulate transpiration, increase water absorption, and secrete substances.

This article was most recently revised and updated by Amy Tikkanen.