- crown glass
- a glass of low refractive index (achieved by incorporating a considerable percentage of phosphorus pentoxide); used in combination with flint glass in multielement lenses.
Medical dictionary. 2011.
crown glass
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crown-glass — [ kronglas ] n. m. inv. • 1764; mots angl. « verre de couronne » ♦ Opt. Verre très transparent et peu dispersif servant à faire des lentilles d optique. ⇒CROWN GLASS, subst. masc. Verre blanc de qualité supérieure, employé pour la fabrication de… … Encyclopédie Universelle
Crown glass — Glass Glass (gl[.a]s), n. [OE. glas, gles, AS. gl[ae]s; akin to D., G., Dan., & Sw. glas, Icel. glas, gler, Dan. glar; cf. AS. gl[ae]r amber, L. glaesum. Cf. {Glare}, n., {Glaze}, v. t.] [1913 Webster] 1. A hard, brittle, translucent, and… … The Collaborative International Dictionary of English
Crown glass — Crown Crown (kroun), n. [OE. corone, coroun, crune, croun, OF. corone, corune, F. couronne, fr. L. corona crown, wreath; akin to Gr. korw nh anything curved, crown; cf. also L. curvus curved, E. curve, curb, Gael. cruinn round, W. crwn. Cf.… … The Collaborative International Dictionary of English
Crown glass — is either of two kinds of glass: Crown glass (window) was a type of hand blown window glass. Crown glass (optics) is a type of optical glass used in lenses. This disambiguation page lists articles associated with the same title. If an … Wikipedia
crown glass — crown′ glass n. 1) opt cer an optical glass of low dispersion and generally low index of refraction 2) cer an old form of window glass formed by blowing a globe and whirling it into a disk • Etymology: 1700–10 … From formal English to slang
crown glass — n. 1. window glass made in flat, circular plates by blowing and whirling, with a small knot in the center left by the blower s rod 2. a very clear optical glass with a low index of refraction … English World dictionary
crown glass — 1. an optical glass of low dispersion and generally low index of refraction. 2. an old form of window glass formed by blowing a globe and whirling it into a disk. [1700 10] * * * handmade glass of soda lime composition for domestic glazing… … Universalium
crown glass — noun 1. a glass blown into a globe which is later flattened and spun to form a disk • Hypernyms: ↑glass 2. optical glass of low dispersion and low refractive index • Syn: ↑optical crown, ↑optical crown glass • Hypernyms: ↑optical glass … Useful english dictionary
crown-glass — (krôn glas ) s. m. Espèce de verre constitué par 1 atome quadrisilicate de potasse et 1 atome quadrisilicate de chaux. C est un verre blanc de la plus belle qualité, qui est employé dans les lunettes achromatiques. ÉTYMOLOGIE Angl. crown glass … Dictionnaire de la Langue Française d'Émile Littré
crown glass — kronas statusas T sritis chemija apibrėžtis Optinis stiklas, turintis didelį lūžio rodiklį ir nedidelę sklaidą. atitikmenys: angl. crown glass rus. крон … Chemijos terminų aiškinamasis žodynas
Crown glass (optics) — This article is about crown glass as used in optics. For the window glass, see Crown glass (window). Crown glass is type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low… … Wikipedia
