- the outer part or external layers of an internal organ, as of the kidney or the adrenal glands
- the outer layer of gray matter over most of the brain
- a layer of tissue in the roots and stems of dicotyledonous plants, located between the stele and epidermis
- loosely any layer of stem tissue external to the xylem
- an outer layer of tissue in certain algae, lichens, and fungi
- Pharmacy the bark or rind of a plant
Origin: Classical Latin bark of a tree: see corium
Used by arrangement with John Wiley & Sons, Inc.
noun pl. cor·ti·ces or cor·tex·es
- Anatomy a. The outer layer of an internal organ or body structure, as of the kidney or adrenal gland.b. The outer layer of gray matter that covers the surface of the cerebral hemisphere.
- Botany The region of tissue in a root or stem lying between the epidermis and the vascular tissue.
- An external layer, such as bark or rind.
Origin: Latin, bark; see sker-1 in Indo-European roots.
cortex - Computer Definition
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cortex - Medical Definition
noun pl. cor·tex·es or cor·ti·ces
- The outer layer of an internal organ or body structure, as of the kidney.
- The cerebral cortex.
cortex - Science Definition
- The outer layer of an organ or body part, such as the cerebrum or the adrenal glands.
- The region of tissue lying between the epidermis (the outermost layer) and the vascular tissue in the roots and stems of plants. It is composed of collenchyma, parenchyma, and sclerenchyma. In roots the cortex transfers water and minerals from the epidermis to the vascular tissue, which distributes them to other parts of the plant. The cortex also provides structural support and stores food manufactured in the leaves. See illustration at xylem.
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