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cortex

/ˈkɔɹtɛks/ noun C2
  1. The outer layer of an internal organ or body structure, such as the kidney or the brain. (countable)
  2. The tissue of a stem or root that lies inward from the epidermis, but exterior to the vascular tissue. (uncountable)
  3. The outer surface of a piece of flint. (countable, uncountable)

Plural cortexes

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This structure acts as a central relay station, processing visual and auditory data before sending it to the cerebral cortex for interpretation.
The Scent of the Past, p. 1 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.