Epidermis: 1. The outermost layer of skin consisting of several layers of epithelial cells&emdash;notably, keratinocytes&emdash;and, in the inner layer of the epidermis, basal cells and melanocytes. 2. The outer layer of cells in the plant body, often covered by a waxy cuticle.

 

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Epidermis: 1. The outermost layer of skin consisting of several layers of epithelial cells&emdash;notably, keratinocytes&emdash;and, in the inner layer of the epidermis, basal cells and melanocytes. 2. . . . View Full Definition

Root Hairs: Extensions of the root epidermis that increase the roots ability to absorb water.

Plastids: Membrane-bound organelles in plant cells that function in storage (of food or pigments) or food production. Term for any double membrane-bound organelle. Chloroplasts contain the chemicals f . . . View Full Definition

Skin: One of eleven major body organ systems in animals; the outermost layer protecting multicellular animals from the loss or exchange of internal fiuids and from invasion by foreign microorganis . . . View Full Definition

Palisade: Layer of mesophyll cells in leaves that are closely placed together under the epidermal layer of the leaf. Palisade parenchyma: Columnar cells located just below the upper epidermis in leave . . . View Full Definition

Stomata: Pores on the underside of leaves that can be opened or closed to control gas exchange and water loss. Openings in the epidermis (usually of the leaf) that allow gas exchange.

Hydroxy Acids: Substances penetrating the epidermis and upper dermis aiming to slough dead skin cells, used as anti-aging and anti-wrinkle ingredient in skin care products, the large cosmetic market based . . . View Full Definition

Trichomes: Extensions from the epidermis of the plant that provide shade and protection for the plant.

Pacinian Corpuscles: Sensory receptors located deep in the epidermis that detect pressure and vibration.

Melanocytes: The cells in the inner layer of the epidermis that produce melanin.