noun
electromagnetic radiation that can produce photochemical reactions
• Syn: ↑actinic radiation
• Hypernyms: ↑electromagnetic radiation, ↑electromagnetic wave, ↑nonparticulate radiation
• Hyponyms:
↑infrared, ↑infrared light, ↑infrared radiation, ↑infrared emission, ↑light, ↑visible light, ↑visible radiation, ↑ultraviolet, ↑ultraviolet radiation, ↑ultraviolet light, ↑ultraviolet illumination, ↑UV
• Part Holonyms: ↑electromagnetic spectrum
* * *
noun : a radiation (as the green, blue, violet, and ultraviolet rays of the spectrum) having marked photochemical action
* * *
Physics.
a ray of light of short wavelengths, as ultraviolet or violet, that produces photochemical effects.
[1835-45]
Useful english dictionary. 2012.