of electromagnetic radiation beyond (higher in frequency than) light visible to the human eye; radiation with wavelengths from 380 nanometre - 10 nanometre

Ultraviolet colour.

plural of ultraviolet

the longest ultraviolet wavelength, penetrating the deepest and causing the vast majority of UV radiation

(uncountable) Light in the ultraviolet part of the spectrum. / (countable) A light bulb that emits ultraviolet light; a black light.

plural of ultraviolet light

(astronomy) An observational branch of astronomy, which deals with the study of ultraviolet emission from celestial objects.

(physics) A fault in classical physics, from the Rayleigh's Law/Rayleigh-Jeans Law outcomes at short wavelengths/high frequencies, that causes infinite amplification of shorter wavelength/higher frequency radiation inside a cavity, due to the application of equipartition theorem on black body radiation within a cavity.

the shortest ultraviolet wavelength, unable to penetrate the Earth's atmosphere

The second shortest ultraviolet wavelength and the main cause of sunburn.