Webster's Revised Unabridged Dictionary · 1913

Visor

Visor , noun

[Old English visere, French visière, from Old French vis. See Visage, Vision.]

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.
A mask used to disfigure or disguise.
My very visor began to assume life. — Shakespeare
My weaker government since, makes you pull off the visor. — Sir P. Sidney
3.
The fore piece of a cap, projecting over, and protecting the eyes.