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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 ray of light, heat, or the like, when it enters obliquely a medium of a different density from that through which it has previously moved..

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

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

Emmetropia :: Emmetropia (n.) That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; -- opposed to hypermetropia, myopia, an astigmatism..

Segregate :: Segregate (v. i.) To separate from a mass, and collect together about centers or along lines of fracture, as in the process of crystallization or solidification..

Flint :: Flint (n.) A massive, somewhat impure variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel..

Deflection :: Deflection (n.) A deviation of the rays of light toward the surface of an opaque body; inflection; diffraction.

Wreck :: Wreck (v. t.) The ruins of a ship stranded; a ship dashed against rocks or land, and broken, or otherwise rendered useless, by violence and fracture; as, they burned the wreck..

Neurine :: Neurine (n.) A poisonous organic base (a ptomaine) formed in the decomposition of protagon with boiling baryta water, and in the putrefraction of proteid matter. It was for a long time considered identical with choline, a crystalline body originally obtained from bile. Chemically, however, choline is oxyethyl-trimethyl-ammonium hydroxide, while neurine is vinyl-trimethyl-ammonium hydroxide..

Unruly :: Unruly (superl.) Not submissive to rule; disregarding restraint; disposed to violate; turbulent; ungovernable; refractory; as, an unruly boy; unruly boy; unruly conduct..

Fractionally :: Fractionally (adv.) By fractions or separate portions; as, to distill a liquid fractionally, that is, so as to separate different portions..

Asphaltum :: Asphaltum (n.) Mineral pitch, Jews' pitch, or compact native bitumen. It is brittle, of a black or brown color and high luster on a surface of fracture; it melts and burns when heated, leaving no residue. It occurs on the surface and shores of the Dead Sea, which is therefore called Asphaltites, or the Asphaltic Lake. It is found also in many parts of Asia, Europe, and America. See Bitumen..

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..

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

Algorithm :: Algorithm (n.) The art of calculating with any species of notation; as, the algorithms of fractions, proportions, surds, etc..

Joint :: "Joint (n.) A plane of fracture, or divisional plane, of a rock transverse to the stratification..

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..

Anfractuose :: Anfractuose (a.) Anfractuous; as, anfractuose anthers..

Refractory :: Refractory (a.) Resisting ordinary treatment; difficult of fusion, reduction, or the like; -- said especially of metals and the like, which do not readily yield to heat, or to the hammer; as, a refractory ore..

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