cortex

Etymology

From Latin cortex (“cork, bark”).

noun

  1. (countable, anatomy) The outer layer of an internal organ or body structure, such as the kidney or the brain.
  2. (uncountable, botany) The tissue of a stem or root that lies inward from the epidermis, but exterior to the vascular tissue.
  3. (archaeology) The outer surface of a piece of flint.

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