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| Ultraviolet Rays Actinic Rays | Actinic Ray | Ray, Actinic | Ray, Ultraviolet | Rays, Actinic | Rays, Ultraviolet | Ultraviolet Ray 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. |