- ultraviolet⇄adj. 1. of or having to do with the invisible part of the spectrum whose rays have wavelengths shorter than those of the violet end of the visible spectrum and longer than those of the X rays.
Ex. ultraviolet light.
2. of or having to do wit - ultraviolet⇄noun the part of the spectrum comprising these rays. (Abbr:) UV (no periods).
- ultraviolet⇄ultraviolet, adjective, noun.