visor

noun

1. Armor.
   1. (on a close helmet) a piece having slits or holes for vision, situated above and pivoted with a beaver or a ventail and beaver.
   2. a similar piece of plate having holes or slits for vision and breathing, attached to or used with any of various other helmets, as the armet, sallet, basinet, or helm.
2. the projecting front brim of a cap.
3. a rigid adjustable flap on an automobile windshield that can shield the eyes of a driver from direct sunlight or glare.
4. a means of concealment; disguise.

verb (used with object)

5. to protect or mask with a visor; shield.

noun

1. a transparent flap on a helmet that can be pulled down to protect the face
2. a piece of armour fixed or hinged to the helmet to protect the face and with slits for the eyes
3. another name for peak (def. 6)
4. a small movable screen used as protection against glare from the sun, esp one attached above the windscreen of a motor vehicle
5. archaic, or literary a mask or any other means of disguise or concealment

verb

6. (tr) to cover, provide, or protect with a visor; shield

n.

c.1300, “front part of a helmet,” from Anglo-French viser, from Old French visiere, from vis “face” (see visage). Meaning “eyeshade” is recorded from 1925.