ultraviolet

Denoting electromagnetic rays at higher frequency than the violet end of the visible spectrum.
- u. A (UVA) u. radiation from 320 to 400 nm that causes skin tanning but is very weakly sunburn-producing and carcinogenic.
- u. B (UVB) u. radiation from 290 to 320 nm that most effectively causes sunburning and tanning; excessive UVB exposure is a cause of cancer of fair skin.
- u. C u. radiation from 200 to 290 nm; UVC in sunlight does not reach the surface of the earth; germicidal and mercury arc lamps may cause sunburn and photokeratitis.
- extravital u. having wavelengths of 2900 to 1850 Å.
- intravital u. having wavelengths of 3900 to 3200 Å.

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ul·tra·vi·o·let .əl-trə-'vī-(ə-)lət adj
1) situated beyond the visible spectrum at its violet end used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays
2) relating to, producing, or employing ultraviolet radiation
ultraviolet n ultraviolet radiation

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ul·tra·vi·o·let (ul″trə-viґə-lət) beyond the violet end of the spectrum; said of electromagnetic rays or radiation between the violet rays and the x-rays, that is, with wavelengths between 200 and 400 nm. These rays have powerful actinic and chemical properties, inducing sunburn and tanning of the skin and producing ergocalciferol (vitamin D2) by their action on ergosterol in the skin.

Medical dictionary. 2011.

Look at other dictionaries:

  • ULTRAVIOLET — L’ultraviolet est le domaine des radiations électromagnétiques s’étendant depuis la limite violette du spectre visible (400 nm) jusqu’à la région des rayons X mous, qu’il recouvre partiellement (cf. figure). Cette délimitation repose… …   Encyclopédie Universelle

  • UltraViolet — es un Sistema de Derechos digitales (DRM) basado en la nube, desarrollado por DECE LLC, un consorcio que incluye a Sony, Adobe, Cisco, HP, Microsoft e Intel.[1] [2] Apple y Disney no soportan este formato.[3] UltraViolet pretende cr …   Wikipedia Español

  • ultraviolet — ULTRAVIOLÉT, Ă, ultravioleţi, te, adj. (Despre radiaţiile electromagnetice; şi substantivat, f. pl.) Care are lungimea de undă mai mică decât lungimea de undă minimă a radiaţiilor vizibile. [pr.: vi o ] – Din fr. ultraviolet. Trimis de ana… …   Dicționar Român

  • Ultraviolet — (engl. für ultraviolett) steht für: Ultraviolettstrahlung (UV Licht), elektromagnetische Strahlung Ultraviolet (Film) (2006), einen Science Fiction Thriller UltraViolet Ist ein Video Standard für eine Cloud Basierte Speicherung und Wiedergabe mit …   Deutsch Wikipedia

  • 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.… …   The Collaborative International Dictionary of English

  • ultraviolet — [ul΄trə vī′ə lit] adj. 1. pertaining to a band of electromagnetic radiation having wavelengths (from c. 5 to c. 400 nanometers) that are shorter than violet light 2. of, pertaining to, or producing radiation of such wavelengths n. ultraviolet… …   English World dictionary

  • ultraviolet — beyond the violet end of the visible spectrum, 1840, from ULTRA (Cf. ultra ) + VIOLET (Cf. violet). Ultra red (1870) was a former name for what now is called infra red …   Etymology dictionary

  • ultraviolet — ► NOUN ▪ electromagnetic radiation having a wavelength just shorter than that of violet light but longer than that of X rays. ► ADJECTIVE ▪ denoting such radiation …   English terms dictionary

  • Ultraviolet — UV redirects here. For other uses, see UV (disambiguation). UVB redirects here. For the mysterious shortwave radio station in Russia, see UVB 76. For other uses, see Ultraviolet (disambiguation). False color image of the Sun s corona as seen in… …   Wikipedia

  • Ultraviolet A — One of the three types of invisible light rays (together with ultraviolet B and ultraviolet C) given off by the sun. Although ultraviolet C is the most dangerous type of ultraviolet light in terms of its potential to harm life on earth, it cannot …   Medical dictionary

  • Ultraviolet B — One of the three types of invisible light rays (together with ultraviolet A and ultraviolet C) given off by the sun. Although ultraviolet C is the most dangerous type of ultraviolet light in terms of its potential to harm life on earth, it cannot …   Medical dictionary

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