/ ˈvaɪzə(r); NAmE / noun
1.
a part of a helmet that can be pulled down to protect the eyes and face
—picture at crash helmet
2.
a curved piece of plastic, etc. worn on the head above the eyes to protect them from the sun
3.
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
—picture at car
4.
( NAmE ) = peak (4)
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WORD ORIGIN
Middle English : from Anglo-Norman French viser , from Old French vis face, from Latin visus sight, from videre to see.