Definition of "ultraviolet" []

  • 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. (adjective)
  • Ultraviolet light or the ultraviolet part of the spectrum. (noun)
  • 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 (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • Of, relating to, or consisting of radiation lying in the ultraviolet (adjective) (c) HarperCollins Publishers Ltd 2016

Use "ultraviolet" in a sentence
  • "The Restore Clean Water System from HoMedics claims that its built-in ultraviolet lights will kill 99. 9999% of bacteria, 99.99% of viruses and 99.95% of microbial cysts in your drinking water."
  • "Paget, investigated the significance of a green fluorescence visible in ultraviolet light which pointed to adrenaline in the presence of O2, and alkali, and found that this appears to a high degree specific for adrenaline."
  • "The band from 0.1 to 0.4 micrometers is called ultraviolet radiation."