Definitions
1.NounA 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.NounA mask for the face.
3.NounThe fore piece of a cap, projecting over, and protecting the eyes.
4.NounA rigid adjustable flap on an automobile windshield that can shield the eyes of a driver from direct sunlight or glare.
5.VerbTo cover with, or as if with, a visor.