black light

black light

noun
invisible infrared or ultraviolet light.

Origin:
1925–30

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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.
The American Heritage® Science Dictionary
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