Definitions for ultraviolet rays
This page provides all possible meanings and translations of the word ultraviolet rays
U.S. National Library of Medicine
That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
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"ultraviolet rays." Definitions.net. STANDS4 LLC, 2013. Web. 6 Dec. 2013. <http://www.definitions.net/definition/ultraviolet rays>.