Meaning

noun the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum

noun the tissue forming the outer layer of an organ or structure in plant or animal

noun the tissue that surrounds the lens nucleus

originEtymology tree Proto-Indo-European *(s)ker- Proto-Indo-European *(s)kert- Proto-Indo-European *(s)kort-ek-sder. Latin cortexbor. English cortex Borrowed from Latin cortex (“cork, bark”).

Etymology from Wiktionary, CC BY-SA 3.0