Pronunciation: (vī'zur), [key]
a. (on a close helmet) a piece having slits or holes for vision, situated above and pivoted with a beaver or a ventail and beaver. See diag. under close helmet.
b. 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.
to protect or mask with a visor; shield. Also,vizor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.