A visor can be pictured as one stiff piece that sits in front of your face or just above your eyes, and stops something from reaching them. On a helmet it stops blows, wind and rain; on a cap, a car roof or a headband it stops sunlight; on an old mask it stops other people's looks. The piece is always flat or gently curved, always out in front, and usually it can be moved — lifted, pulled down, or turned aside — because you only want it there some of the time.
From the word’s history
The word came into English from French: Middle English viser, from Anglo-Norman viser and Old French visiere. Its earliest English use is the face-piece of a helmet, which is also the most concrete picture the later uses hang on.
這個字從法文進入英文：中古英文 viser，來自 Anglo-Norman 的 viser 與古法文 visiere。英文裡最早的用法就是頭盔上那片擋臉的板子。後來的各種意思，可以想成都是從這片板子延伸出去的。
Wiktionary entry supplied in this packet (source_ref kaikki:3f6f69a190036ae4:577222460), etymology_text: "From Middle English viser, from Anglo-Norman viser and Old French visiere."
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