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Black light

noun, slang

Definitions

Noun
  1. 1
    A light bulb that emits ultraviolet light, usually used to create the illusion that anything white is glowing. countable

    "Blacklights and a mirrored disco ball Every night's another reason why I left it all"

  2. 2
    Ultraviolet radiation or light. slang, uncountable

Etymology

From black + light, since ultraviolet light is invisible to the human eye.

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