Definition of cortex noun from the Oxford Advanced American Dictionary

 

cortex

 noun
noun
NAmE//ˈkɔrtɛks//
 
(pl. cortices
NAmE//ˈkɔrt̮əsiz//
 
)
(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 )
NAmE//ˈkɔrt̮ɪkl//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: cortex