a light or lamp, usually equipped with a reflector, on the front of an automobile, locomotive, etc.

1860–65, Americanism; head + light1

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World English Dictionary
headlight or headlamp (ˈhɛdˌlaɪt)
See also quartz-iodine lamp a powerful light, equipped with a reflector and attached to the front of a motor vehicle, locomotive, etc
headlamp or headlamp

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He crossed at night, a locomotive headlight affixed to either each of the cable.
They were designed that way to comply with federal regulations for headlight
So big, it blew the headlight beams right off the road.
Or maybe those retractable headlight washers would be useful after all.
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