Ultraviolet

adjective
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.
noun
3.
ultraviolet radiation.
noun
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
adjective
2.
of, relating to, or consisting of radiation lying in the ultraviolet: ultraviolet radiation, UV

ultraviolet ul·tra·vi·o·let (ŭl’trə-vī’ə-lĭt)
adj.
Abbr. UV, U.V.
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. n.
Ultraviolet light or the ultraviolet part of the spectrum.
ultraviolet
(ŭl’trə-vī’ə-lĭt)
Adjective 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.

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