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pl. cortices [L. cortex, stem cortic-, rind]
1. The outer layer of an organ as distinguished from the inner medulla, as in the adrenal gland, kidney, ovary, lymph node, and thymus.
2. The outer layer of a structure, as a hair or the lens of the eye.
3. In the brain, a surface sheet of layered or laminated gray matter, as in the outermost sector of the cerebral and cerebellar hemispheres.
4. The outer superficial portion of the stem or root of a plant.