ultraviolet

Physics: A term applied to the rays beyond the violet, or high, end of the spectrum (q. v.). The vibrations of these rays are too rapid for vision, but they po e greater chemical activity than any others. *ŭl-trage (age as Ig), s . [OUTRAGE, 8.] ŭl-tra-işm, s. [Eng. ultra ; -ism.] The prin ciples of ultras, or of those who advocate extreme measures, as of reform, . ŭl-tra-Ist, subst . [Eng. ultra ; -ist.] One who pushes a principle, doctrine, or measure to extremes; one who advocates extreme measures; an ultra.