Definition of cortex noun from the Oxford Advanced Learner's Dictionary

 

cortex

 noun
noun
BrE BrE//ˈkɔːteks//
 
; NAmE NAmE//ˈkɔːrteks//
 
(pl. cortices
BrE BrE//ˈkɔːtɪsiːz//
 
; NAmE NAmE//ˈkɔːrtɪsiːz//
 
)
(anatomy)
 
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the outer layer of an organ in the body, especially the brain the cerebral/renal cortex (= around the brain/ kidney) Word Origin late Middle English: from Latin, literally ‘bark’.
See the Oxford Advanced American Dictionary entry: cortex