- 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 of cortexClassical Latin bark of a tree: see corium
nounpl. 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 of cortexLatin, bark; see sker-1 in Indo-European roots.
(countable and uncountable, plural cortexes or cortices)
From Latin cortex (“bark”).