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adj. Of or relating to the range of invisible radiation wavelengths from about 4 nanometers, on the border of the x-ray region, to about 380 nanometers, just beyond the violet in the visible spectrum.

n. Ultraviolet light or the ultraviolet part of the spectrum.

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

n. Ultraviolet colour.

adj. Lying outside the visible spectrum at its blue-violet end; -- said of light more refrangible (i. e. having a shorter wavelength) than the extreme violet rays of the visible spectrum. Electromagnetic radiation with wavelengths shorter than those of ultrviolet light are not usually considered as light waves, but are classified differently. The ultraviolet region of the electromagnetic spectrum is generally considered as comprising those electromagnetic emissions with wavelengths lying between those of visible light and those of X-rays, i. e. between 4000 Angstroms and 100 Angstroms.

Beyond the violet: used of the invisible rays of the spectrum which are more refrangible than the violet, and consequently lie beyond them. See spectrum.

adj. having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end

n. radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays

"Paget, investigated the significance of a green fluorescence visible in ultraviolet light which pointed to adrenaline in the presence of O2, and alkali, and found that this appears to a high degree specific for adrenaline."

invisible    unseeable   

ultraviolet radiation   

Violet    inviolate    violet   

infrared    visible-light    infra-ray    ultrared    green-shaded