/ˈvaɪzər/
visor
BrE /ˈvaɪzə(r)/
NAmE /ˈvaɪzər/
a part of a helmet that can be pulled down to protect the eyes and face
a curved piece of plastic, etc. worn on the head above the eyes to protect them from the sun
a small piece of plastic, etc. inside the front window of a car that can be pulled down to protect the driver’s eyes from the sun
(NAmE) = bill (9)