Main Entry: ¹ul·tra·vi·o·let

Pronunciation: \ˌəl-trə-ˈvī-(ə-)lət\

Function: adjective

1 : situated beyond the visible spectrum at its violet end—used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays
2 : relating to, producing, or employing ultraviolet radiation