Webster's English Dictionary

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ultraviolet

ul.tra.vi.o.let \.*l-tr*-'vi--*-l*t\ aj 1: situated beyond the visible 
   spectrum at its violet end - used of radi ation having a wavelength shorter 
   than wavelengths of visible light and longer than those of X rays 2: 
   relating to, producing, or employing ultraviolet radiation  - ultraviolet n