ultraviolet Meaning, Definition & Usage

  1. noun radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays
    ultraviolet radiation; ultraviolet illumination; UV; ultraviolet light.
  2. adjective satellite having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end
    • ultraviolet radiation
    • an ultraviolet lamp

WordNet

Ul`tra*vi"o*let adjective
Etymology
Pref. ultra- + violet.
Definitions
  1. (Physics) Lying outside the visible spectrum at its violet end; -- said of rays more refrangible than the extreme violet rays of the spectrum.

Webster 1913