\bˈa͡ɪəlˌe͡ɪdi], \bˈa‍ɪəlˌe‍ɪdi], \b_ˈaɪ_ə_l_ˌeɪ_d_i]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

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Ultraviolet Ray

  • That portion electromagnetic spectrum immediately below visible range extending into x-ray frequencies. longer near-biotic vital necessary for endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic extravital rays) viricidal, bactericidal, mutagenic, carcinogenic used as disinfectants.
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