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Rainbow :: Rainbow (n.) A bow or arch exhibiting, in concentric bands, the several colors of the spectrum, and formed in the part of the hemisphere opposite to the sun by the refraction and reflection of the sun's rays in drops of falling rain..

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.) One or more aliquot parts of a unit or whole number; an expression for a definite portion of a unit or magnitude.

Refraction :: Refraction (n.) The change in the direction of a ray of light, and, consequently, in the apparent position of a heavenly body from which it emanates, arising from its passage through the earth's atmosphere; -- hence distinguished as atmospheric refraction, or astronomical refraction..

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

Fractional :: Fractional (a.) Of or pertaining to fractions or a fraction; constituting a fraction; as, fractional numbers..

Anaclastic :: Anaclastic (a.) Produced by the refraction of light, as seen through water; as, anaclastic curves..

Measure :: Measure (n.) A standard of dimension; a fixed unit of quantity or extent; an extent or quantity in the fractions or multiples of which anything is estimated and stated; hence, a rule by which anything is adjusted or judged..

Diacaustic :: Diacaustic (a.) Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic..

Infraction :: Infraction (n.) The act of infracting or breaking; breach; violation; nonobservance; infringement; as, an infraction of a treaty, compact, rule, or law..

Abbreviate :: Abbreviate (v. t.) To reduce to lower terms, as a fraction..

Separatrix :: Separatrix (n.) The decimal point; the dot placed at the left of a decimal fraction, to separate it from the whole number which it follows. The term is sometimes also applied to other marks of separation..

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..

Integral :: Integral (a.) Of, pertaining to, or being, a whole number or undivided quantity; not fractional..

Dioptrics :: Dioptrics (n.) The science of the refraction of light; that part of geometrical optics which treats of the laws of the refraction of light in passing from one medium into another, or through different mediums, as air, water, or glass, and esp. through different lenses; -- distinguished from catoptrics, which refers to reflected light..

Reduce :: Reduce (n.) To change the form of a quantity or expression without altering its value; as, to reduce fractions to their lowest terms, to a common denominator, etc..

Reciprocal :: Reciprocal (n.) The quotient arising from dividing unity by any quantity; thus, / is the reciprocal of 4; 1/(a +b) is the reciprocal of a + b. The reciprocal of a fraction is the fraction inverted, or the denominator divided by the numerator..

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

Aphakia :: Aphakia (n.) An anomalous state of refraction caused by the absence of the crystalline lens, as after operations for cataract. The remedy is the use of powerful convex lenses..

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..

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