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The Collaborative International Dictionary of English v.0.48 (gcide)

Headlight \Head"light`\ (h[e^]d"l[imac]t`), n. (Engin.)
A light, with a powerful reflector, placed at the front of a
vehicle such as an automobile, truck, locomotive etc., to
throw light on the road or track ahead of the vehicle at
night, or in going through a dark tunnel; a {headlamp}.
[1913 Webster PJC]


headlamp \head"lamp`\ (h[e^]d"l[a^]mp`), n.
A powerful light with a reflector, attached to the front of
an automobile, locomotive, or other vehicle; called also
{headlight}.

Syn: headlight.
[WordNet 1.5]