fog light

noun
an automobile headlight throwing light of a color intended to diminish the effect of fog, dust, etc., in the air.

Origin:
1960–65

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World English Dictionary
fog light
 
n
another word for fog lamp

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Drivers turn on the rear fog light when driving in fog as a courtesy to following drivers and as a safety measure for themselves.
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