Cor″ti‐cal (k?r″t?–kal), a. [L. cortex bark: cf. F. cortical.] Belonging to, or consisting of, bark or rind; resembling bark or rind; external; outer; superficial; as, the cortical substance of the kidney.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.