black light

noun

invisible infrared or ultraviolet light.

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Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Black light is always a great word to know.

So is doohickey. Does it mean:

a chattering or flighty, light-headed person.

a gadget; dingus; thingumbob.

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Collins

World English Dictionary

black light

—n
	the invisible electromagnetic radiation in the ultraviolet and infrared regions of the spectrum

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Science Dictionary

black light
Invisible ultraviolet radiation. Black light causes certain fluorescent materials to emit visible light.

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"To love someone is to isolate him from the world, wipe out every trace of him, dispossess him of his shadow, drag him into a murderous future. It is to circle around the other like a dead star and absorb him into a black light."

-Jean Baudrillard