1. beyond the violet in the spectrum, corresponding to light having wavelengths shorter than 4000 angstrom units.
  2. pertaining to, producing, or utilizing light having such wavelengths: an ultraviolet lamp.


  1. ultraviolet radiation.


  1. the part of the electromagnetic spectrum with wavelengths shorter than light but longer than X-rays; in the range 0.4 × 10 –6 and 1 × 10 –8 metres


  1. of, relating to, or consisting of radiation lying in the ultravioletultraviolet radiation Abbreviation: UV

“beyond the violet end of the visible spectrum,” 1840, from ultra- + violet. Ultra-red (1870) was a former name for what now is called infra-red. adj.

  1. Of or relating to the range of invisible radiation wavelengths from about 4 nanometers, on the border of the x-ray region, to about 380 nanometers, just beyond the violet in the visible spectrum.


  1. Ultraviolet light or the ultraviolet part of the spectrum.


  1. Relating to electromagnetic radiation having frequencies higher than those of visible light but lower than those of x-rays, approximately 1015-1016 hertz. Some animals, such as bees, are capable of seeing ultraviolet radiation invisible to the human eye. See more at electromagnetic spectrum.


  1. Ultraviolet light or the ultraviolet part of the spectrum. See Note at infrared.

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