Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Invisible ultraviolet or infrared radiation. Black light causes fluorescent materials to emit visible light and is used to take pictures in the dark.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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  • Merriam-Webster Dictionary:
    noun
    Date: 1927
    invisible ultraviolet light

    February 4, 2008