ultraviolet
adjective uk/ˌʌl.trəˈvaɪə.lət/ us/ˌʌl.trəˈvaɪə.lət/ (abbreviation UV)
紫外线的
Ultraviolet light has a wavelength that is after the violet (= light purple) end of the range of colours that can be seen by humans. Light of this type causes the skin to become darker in the sun.