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Dioptrical :: Dioptrical (a.) Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope..

Breach :: Breach (n.) Specifically: A breaking or infraction of a law, or of any obligation or tie; violation; non-fulfillment; as, a breach of contract; a breach of promise..

Millesimal :: Millesimal (a.) Thousandth; consisting of thousandth parts; as, millesimal fractions..

Spectrum :: Spectrum (n.) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope..

Refractive :: Refractive (a.) Serving or having power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers..

Fractionate :: Fractionate (v. t.) To separate into different portions or fractions, as in the distillation of liquids..

Inflection :: Inflection (n.) Same as Diffraction.

Diffractive :: Diffractive (a.) That produces diffraction.

Fractionary :: Fractionary (a.) Fractional.

Lap :: Lap (n.) One circuit around a race track, esp. when the distance is a small fraction of a mile; as, to run twenty laps; to win by three laps. See Lap, to fold, 2..

Iceland Spar :: Iceland spar () A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction. Cf. Calcite..

Refractor :: Refractor (n.) A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens..

Fraction :: Fraction (n.) The act of breaking, or state of being broken, especially by violence..

Benzene :: Benzene (n.) A volatile, very inflammable liquid, C6H6, contained in the naphtha produced by the destructive distillation of coal, from which it is separated by fractional distillation. The name is sometimes applied also to the impure commercial product or benzole, and also, but rarely, to a similar mixed product of petroleum..

Halo :: Halo (n.) A luminous circle, usually prismatically colored, round the sun or moon, and supposed to be caused by the refraction of light through crystals of ice in the atmosphere. Connected with halos there are often white bands, crosses, or arches, resulting from the same atmospheric conditions..

Refractometer :: Refractometer (n.) A contrivance for exhibiting and measuring the refraction of light.

Prism :: Prism (n.) A transparent body, with usually three rectangular plane faces or sides, and two equal and parallel triangular ends or bases; -- used in experiments on refraction, dispersion, etc..

Sexagesimal :: Sexagesimal (n.) A sexagesimal fraction.

Scrip :: Scrip (n.) Paper fractional currency.

Catadioptrical :: Catadioptrical (a.) Pertaining to, produced by, or involving, both the reflection and refraction of light; as, a catadioptric light..

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