a part of a helmet that can be pulled down to protect the eyes and face （头盔上的）面甲，面罩，护面 a curved piece of plastic, etc. worn on the head above the eyes to protect them from the sun 遮阳帽舌 a small piece of plastic, etc. inside the front window of a car that can be pulled down to protect the driver’s eyes from the sun （汽车内挡风玻璃上方的）遮阳板 
- (also bill)(both North American English)(British English peak)
the stiff front part of a cap that sticks out above your eyes 帽舌；帽檐
Word OriginMiddle English: from Anglo-Norman French viser, from Old French vis ‘face’, from Latin visus ‘sight’, from videre ‘to see’.