vi ‧ sor /ˈvaɪzə $ -ər/ BrE AmE noun [countable]
[ Date: 1200-1300 ; Language: Anglo-French ; Origin: viser , from Old French visiere , from vis ; ⇨ ↑ visage ]
1 . the part of a ↑ helmet (=protective hard hat) that can be lowered to protect your face
2 . American English the curved part of a cap that sticks out in front above your eyes SYN peak British English
3 . a flat object fixed above the front window inside a car that can be moved down to keep the sun out of your eyes
4 . a curved piece of plastic that you wear on your head so that it sticks out above your eyes and protects them from the sun