Definitions for black light
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Random House Webster's College Dictionary
black′ light′(n.)
invisible infrared or ultraviolet light.
Category: Physics
Origin of black light:
1925–30
Wiktionary
black light(Noun)
Light bulb that emits ultraviolet light, usually used to create the illusion that anything white is glowing.
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"black light." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/black light>.