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halogen lamp

noun
1.
a gas-filled, high-intensity incandescent lamp having a tungsten filament and containing a small amount of a halogen, such as iodine, that vaporizes on heating and redeposits any evaporated tungsten particles back onto the filament: used especially in motion-picture projectors and automobile headlights.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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