Definition of ultraviolet in English:

ultraviolet

Syllabification: ul·tra·vi·o·let
Pronunciation: /ˌəltrəˈvī(ə)lət
 
/
Physics

adjective

1(Of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.
More example sentences
  • Diode lasers are now available in discrete colors from the infrared to blue and into the near ultraviolet.
  • But what is so special about water that makes its absorptions extend all the way from the far infrared to the near ultraviolet?
  • Most medical lasers emit light which are either ultraviolet, infrared or in the visible spectrum of light.
1.1(Of equipment or techniques) using or concerned with this radiation: an ultraviolet telescope
More example sentences
  • The processor industry-backed company developing extreme ultraviolet lithography chip-making equipment has demonstrated its first prototype.
  • The 59-year-old women were both photographed with special ultraviolet cameras that captured every sun-induced blemish on their faces and another camera that recorded wrinkles.
  • Taylor advised students ‘to help the police and yourself and keep all laptops and computers out of sight, and have valuables marked with ultraviolet pens to help us trace stolen property.’

noun

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The ultraviolet part of the spectrum; ultraviolet radiation.
More example sentences
  • Once CFCs are released into the atmosphere, only strong ultraviolet radiation can break them down.
  • Broad-spectrum ultraviolet radiation from the sun or artificial light sources was added as a known carcinogen.
  • The ultraviolet radiation in natural sunlight was later identified as a mutagen.

Ultraviolet radiation spans wavelengths from about 10 nm to 400 nm and is an important component of sunlight although the ozone layer prevents much of it from reaching the earth’s surface. While ultraviolet is necessary for the production of vitamin D2 in the skin, excessive exposure can be harmful, causing skin cancer and genetic mutation

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