\pə͡ʊstpˈə͡ʊnta͡ɪl], \pə‍ʊstpˈə‍ʊnta‍ɪl], \p_əʊ_s_t_p_ˈəʊ_n_t_aɪ_l]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland

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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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