black light

black light
noun
: invisible ultraviolet or infrared light

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invisible infrared or ultraviolet light.
[1925-30]

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black light noun
Invisible infrared or ultraviolet electromagnetic radiation
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Main Entry:black

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black light,
a kind of ultraviolet light imperceptible to the human eye, used to take photographs at night and to give a fluorescent effect.

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n. ultraviolet or infrared radiation, invisible to the eye

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ˌblack ˈlight 7 [black light] noun uncountable
ultraviolet or ↑infraredrays, which cannot be seen

Useful english dictionary. 2012.

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