visor
noun [ C ] uk/ˈvaɪ.zər/ us/ˈvaɪ.zɚ/
（头盔上的）活动面罩;遮阳帽舌
a part of a helmet that can be pulled down to cover the face, or a curved piece of stiff material that is worn above the eyes to give protection from strong light from the sun
（汽车前窗上方的）遮日板
a piece of stiff material above the front window of a car, etc. that can be pulled down to give protection from strong light from the sun
US (UK peak)帽舌
the flat, curved part of a cap that goes above the eyes of the person who is wearing it