blacklight

/B L AE1 K L AY0 T/
noun
  1. 1

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

  2. 2

    Ultraviolet radiation/light

Source: https://en.wiktionary.org/wiki/black%20light, https://en.wiktionary.org/wiki/blacklight