GNU Collaborative International Dictionary of English

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1.       
   ‖Cortex , n.; pl. Cortices . [L., bark. Cf. Cork.]
   Bark, as of a tree; hence, an outer covering.
   1913 Webster
   (Med.) Bark; rind; specifically, cinchona bark.
   1913 Webster
   (Anat.) The outer or superficial part of an organ; as, the cortex or gray exterior substance of the brain.
   1913 Webster