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ultraviolet 音标拼音: [,ʌltrəv'ɑɪəlɪt] a. 紫外线的 紫外线的 ultraviolet 紫外线 UV ultraviolet 紫外线 ultraviolet adj 1: having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end; "ultraviolet radiation"; "an ultraviolet lamp" n 1: radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays [synonym: {ultraviolet}, {ultraviolet radiation}, {ultraviolet light}, {ultraviolet illumination}, {UV}] Ultraviolet \Ul`tra*vi"o*let\, a. [Pref. ultra- violet.] (Physics) 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. [1913 Webster PJC]
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