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

plural of ultraviolet light

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

a form of non-ionizing radiation emitted by the sun and other artificial sources

the highest-energy, highest-frequency, shortest-wavelength end of the ultraviolet EM band, overlapping with soft X-rays.