1650s, "outer shell, husk," from Latin cortex "bark of a tree" (see corium). Specifically of the brain, first recorded 1741.
cortex cor·tex (kôr'těks')
n. pl. cor·tex·es or cor·ti·ces (-tĭ-sēz')
The outer layer of an internal organ or body structure, as of the kidney.
The cerebral cortex.
cortex (kôr'těks')
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An experimental slow controls project at CERN.
(1994-11-30)