Definition of ultraviolet radiation Ultraviolet radiation

We found 2 definitions of ultraviolet radiation from 2 different sources.

What does ultraviolet radiation mean?

Noun
ultraviolet radiation - radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays
		ultraviolet, ultraviolet light, ultraviolet illumination, UV
		actinic radiation, actinic ray electromagnetic radiation that can produce photochemical reactions

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ultraviolet radiation
The part of the electromagnetic spectrum with wavelengths shorter than light but longer than x-rays; in the range of 4-400 nm.\n(Source: CED)