visor

Short definition from Wiktionary

Noun

1. 1
   A part of a helmet, arranged so as to lift or open, and so show the face. The openings for seeing and breathing are generally in it.
2. 2
   A mask for the face.
3. 3
   The fore piece of a cap, projecting over, and protecting the eyes.
4. 4
   A rigid adjustable flap on an automobile windshield that can shield the eyes of a driver from direct sunlight or glare.

Verb

1. 1
   To cover with, or as if with, a visor.

Proper noun

1. 1
   Initialism of Violent and Sexual Offenders Register.