epidermis
/ˌɛpɪˈdəːmɪs
/noun
1The outer layer of cells covering an organism, in particular:Basal cell carcinomas are derived from the basal layer of keratinocytes, which is the deepest cell layer of the epidermis....
- Basal cell carcinoma is a tumor arising from the basal cell layer of the epidermis.
- There is another layer of cells between the basal cells and the keratin-rich epidermis known as spiny cells.
1.1 Zoology & Anatomy The surface epithelium of the skin of an animal, overlying the dermis.The skin consists of an epidermis, dermis, adipose tissue layer and subcutaneous connective tissue....
- At the end of gastrulation, the epidermis only covers the dorsal region and the ventral region is bare.
- The thickness of the epidermis, dermis, and subcutaneous tissue varies from person to person and from one part of the body to another.
1.2 Botany The outer layer of tissue in a plant, except where it is replaced by periderm.The plant epidermis is a multifunctional tissue playing important roles in water relations, defence and pollinator attraction....
- In the epidermis of third-year leaves, the densest silica deposition was observed in silica cells of both the adaxial and abaxial epidermises as in first-year leaves.
- Leaves are composed of various kinds of tissues, including epidermis, mesophyll, bundle sheath, and vascular bundles.
Derivatives
epidermal
/ adjective ...- Other clays totally mask light penetration and stop gas exchange on epidermal leaf and fruit cells.
- It is hypothesized that ions diffuse through the epidermal walls and enter the short cells at their outer tangential plasma membranes.
- Feeding occurred with tube feet extended through the orals and by epidermal uptake of nutrients.
epidermic
- Fourteen genes were mapped to this region; of these, 11 were expressed in the skin (5 epidermic cytokeratin and 6 hard keratin genes), but none were mutated in hague mice.
- The membranous outer periclinal wall of the epidermic cells would favour water absorption, thus enhancing the adherence and germination capacity, as in some examples of the family Lamiaceae.
epidermoid
- Since the submission of this manuscript, we have seen a second worker from the Rhode Island plant with a lung carcinoma, this one an epidermoid carcinoma in a current smoker.
- The radiologic differential diagnosis included eosinophilic granuloma, hemangioma, and epidermoid tumor.
- This syndrome carries an increased risk of colorectal cancer and associated osteomas, epidermoid cysts and sesmoid tumors.
Origin
Early 17th century: via late Latin from Greek, from epi 'upon' + derma 'skin'.