A movable part of a helmet that can be pulled down to protect the face. The knight lowered his visor before entering the battlefield.
A part of a cap or hat that sticks out to protect or shade the eyes. She adjusted the visor of her cap to block the sun from her eyes.
A screen or shield on a vehicle, such as a sun visor in a car, used to block sunlight. He flipped down the car's visor to shield his eyes from the glaring sun.
A transparent or mesh protective screen worn over the face as part of safety or medical equipment. The welder lowered his protective visor before starting the job.