1. A piece projecting from the front of a cap or an elastic headband to shade or protect the eyes.
2. A small movable screen attached above the windscreen in a vehicle, used as protection against the glare of the sun
3. The front piece of the helmet of a suit of armor, capable of being raised and lowered and designed to protect the eyes, nose, and forehead.
4. A peak on a cap
Eyeshade, Vizor, Peak, Bill
"She pulled down the visor of his cap and trudged ahead"