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)

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.

• "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."