Etymology
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cortex (n.)

1650s, "outer shell, husk;" in botany, zoology, anatomy, "some part or structure resembling bark or rind," from Latin cortex "bark of a tree" (from PIE root *sker- (1) "to cut"). Specifically of the brain, by 1741.

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Definitions of cortex

cortex (n.)
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum;
Synonyms: cerebral cortex / cerebral mantle / pallium
cortex (n.)
the tissue forming the outer layer of an organ or structure in plant or animal;
cortex (n.)
the tissue that surrounds the lens nucleus;
Synonyms: lens cortex
From wordnet.princeton.edu