1. ultraviolet rays; ultraviolet radiation
Wikipedia definition
2. UltravioletFor alternative meanings, see ultraviolet (disambiguation), UV (disambiguation) and UVB-76 radio station. Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV. It is named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the colour violet.
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