Dioptre
Dioptre Di*op"tre, n. [F. See 2d {Dioptric}.] (Optics) A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • dioptre — [ djɔptr ] n. m. • 1547; gr. dioptra ♦ Phys. Surface optique séparant deux milieux de réfringence inégale. ● dioptre nom masculin (grec dioptron, miroir) Surface séparant deux milieux transparents inégalement réfringents. dioptre n. m. OPT… …   Encyclopédie Universelle

  • dioptre — 1. (di o ptr ) s. m. Terme de chirurgie. Sorte de spéculum. ÉTYMOLOGIE    Terme composé de deux mots grecs signifiant à travers et voir. dioptre 2. (di o ptr ) s. f. Terme d arpentage. Quart de cercle, instrument armé de pinnules à travers… …   Dictionnaire de la Langue Française d'Émile Littré

  • Dioptre — En optique, un dioptre est une surface séparant deux milieux transparents d indices de réfraction différents. Si la lumière se propage en ligne droite dans un milieu homogène et isotrope, elle est déviée lors du passage d un dioptre : il y a …   Wikipédia en Français

  • Dioptre — This article is about the unit of measure in optics. For other uses, see Diopter (disambiguation). A dioptre, or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal… …   Wikipedia

  • dioptre — n. the unit of measurement of the power of refraction of a lens. One dioptre is the power of a lens that brings parallel light rays to a focus at a point one metre from the lens, after passing through it. A stronger lens brings light rays to a… …   Medical dictionary

  • dioptre — n. the unit of measurement of the power of refraction of a lens. One dioptre is the power of a lens that brings parallel light rays to a focus at a point one metre from the lens, after passing through it. A stronger lens brings light rays to a… …   The new mediacal dictionary

  • dioptre — n. (US diopter) Optics a unit of refractive power of a lens, equal to the reciprocal of its focal length in metres. Etymology: F dioptre f. L dioptra f. Gk dioptra: see DIOPTRIC …   Useful english dictionary

  • dioptre — unit of measurement of power of lens or eye Units of Measurement …   Phrontistery dictionary

  • dioptre — n. unit of measure of the refractive power of a lens (Optics) …   English contemporary dictionary

  • dioptre — [dʌɪ ɒptə] (US diopter) noun a unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens. Origin C16 (orig. denoting an alidade, later a form of theodolite): from Fr., from L. dioptra, from Gk,… …   English new terms dictionary

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