"cortex" in the noun sense
1. cerebral cortex, cerebral mantle, pallium, cortex
the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
2. cortex
the tissue forming the outer layer of an organ or structure in plant or animal
3. lens cortex, cortex
the tissue that surrounds the lens nucleus
Source: WordNet® (An amazing lexical database of English)
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