headlight

n. light placed on the front of a vehicle, headlamp

A headlamp is a lamp, usually attached to the front of a vehicle such as a car, with the purpose of illuminating the road ahead during periods of low visibility, such as night or precipitation. While it is common for the term headlight to be used interchangeably in informal discussion, headlamp is the technically correct term for the device itself, while headlight properly refers to the beam of light produced and distributed by the device.
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Noun
1. a powerful light with reflector; attached to the front of an automobile or locomotive
(synonym) headlamp
(hypernym) light, light source
(hyponym) foglamp
(part-holonym) electrical system
(part-meronym) Fresnel lens

(n.)
A light, with a powerful reflector, placed at the head of a locomotive, or in front of it, to throw light on the track at night, or in going through a dark tunnel.
  

headlight /'hedlait/
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