cor ‧ tex /ˈkɔːteks $ ˈkɔːr-/ BrE AmE noun ( plural cortices /-təsiːz, -tɪsiːz/) [countable]
[ Date: 1600-1700 ; Language: Latin ; Origin: 'bark (= outer covering of a tree)' ]
the outer layer of an organ in your body, especially your brain
—cortical /ˈkɔːtɪk ə l $ ˈkɔːr-/ adjective