In vertebrates, epidermis is the outermost layer of the skin. Epidermis definition, the outer, nonvascular, nonsensitive layer of the skin, covering the true skin or corium. Its main purpose is protection. The epidermis is the outermost layer of our skin. Epidermal cells include several types of cells that make up the epidermis of plants. Louis, MO. epidermis definitions - from layers, to function, and structures. Definition - What does Epidermis mean? epider´mides) (Gr.) Medical Definition of Epidermis. Content: Human Skin Layers. Skin is made up of three layers. This consists mainly of cells called keratinocytes, made from the tough protein keratin (also the material in hair and nails). Although they serve a number of important functions, their primary role is to protect from a variety of harmful factors (environmental stressors) including microbes, chemical compounds as well as … Definition: The epidermis is the outer layer of the three layers that make up the skin, the inner layers being the dermis and hypodermis. The outermost is the epidermis. General Biology, 11th Edition.St. Learn with flashcards, games, and more — for free. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Epidermis: The upper or outer layer of the two main layers of cells that make up the skin. The epidermis is an outer protective cell layer that provides protection against infection, mechanical injury and water loss in plants. It is mostly made up of flat, scale-like cells called squamous cells. C. V. Mosby . It is the outermost, protoderm-derived layer of cells that covers seeds, fruits, flowers, leaves, roots, and stem parts. In invertebrates, the outermost layer of cells of the organism.. epidermis outer layer of skin cells Source: Noland, George B. The epidermis is mostly made up of flat, scale-like cells called squamous cells. Under the squamous cells are round cells called basal cells. See more. home >> biology >> definition In plants , the outermost layer of cells covering the leaves and young parts of a plant is the epidermis . The epidermis is made of four main layers, or strata: The stratum corneum is the thick, tough outer layer. In vertebrates , epidermis is the outermost layer of the skin . Subcutis is the innermost layer containing loose connective tissues, fatty tissues and elastin, which acts as an intermediate link between the skin and bones. Under the squamous cells are round cells called basal cells. the outermost and nonvascular layer of the skin, derived from the embryonic ectoderm, varying in thickness from 0.07 to 1.4 mm. Epidermis. Definition of Skin 1983. 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