Etymology
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cortical (adj.)

1670s, in botany, "belonging to external covering," from Modern Latin corticalis "resembling or consisting of bark or rind," from cortex (genitive corticis) "bark of a tree" (from PIE root *sker- (1) "to cut"). Also used in anatomy, applied to enveloping parts (distinguished from medullary).

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Definitions of cortical

cortical (adj.)
of or relating to a cortex;
From wordnet.princeton.edu