Short invisible rays of ultraviolet light.
Invisible short-wavelength radiation; it is contained in sunlight, but much of it is absorbed by the atmosphere before reaching the earth, where it causes tanning and burning of the skin. Artificial sources of ultraviolet radiation (e.g., iron or mercury vapor arc in ultraviolet lamps) are sometimes used in medicine to treat rickets and certain skin disorders. Also called ultraviolet light.
Radiant energy extending from 3900 to 200 angstrom units (A.U.) Divided into near ultraviolet, which extends from 3900 to 2900 A.U., and far ultraviolet, which extends from 2900 to 200 A.U.
Radiation in sunlight that is responsible for tanning and burning skin.