cor ‧ ne ‧ a /ˈkɔːniə $ ˈkɔːr-/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Medieval Latin ; Origin: Latin , 'horny' , from cornu 'horn' ; because its structure is like horn ]
the transparent protective covering on the outer surface of your eye
—corneal adjective