noun

1. 1. in armor, a movable part of a helmet, that could be lowered to cover the upper part of the face, with slits for seeing
   2. a movable section, made usually of safety glass, that is part of a protective head covering, as for welders
2. a mask, as for disguise
3. ☆
   1. the projecting front brim of a cap, for shading the eyes
   2. any of certain other shades for the eyes, as an eyeshade
4. a movable shade fastened above the windshield inside a motor vehicle, for shading the eyes

Etymology: ME visere < Anglo-Fr viser < OFr visiere < vis, a face: see visage

transitive verb