\vɛspjˈuːʃəs], \vɛspjˈuːʃəs], \v_ɛ_s_p_j_ˈuː_ʃ_ə_s]\
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  • (See Americus.)
1894 - Dictionary of United States history
By John Franklin Jameson

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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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