ultraviolet_spectrum has definitions from the field of physics
1
[ noun ] (physics) the spectrum of ultraviolet radiation

Used in print

(Walter H. Buchsbaum, "Advances in Medical Electronics"...)

The microscope and orthicon are both selected to operate well into the ultraviolet_spectrum , which means that all lenses must be quartz .

Many_of the cells and microorganisms which are transparent to visible_light , absorb or reflect the much shorter wavelengths of the ultraviolet_spectrum .

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