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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..

Denominator :: Denominator (n.) That part of any expression under a fractional form which is situated below the horizontal line signifying division.

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

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

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..

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

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

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..

Refraction :: Refraction (n.) The correction which is to be deducted from the apparent altitude of a heavenly body on account of atmospheric refraction, in order to obtain the true altitude..

Stereoscopic :: Stereoscope (n.) An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as to appear as one to the observer..

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..

Diffraction :: Diffraction (n.) The deflection and decomposition of light in passing by the edges of opaque bodies or through narrow slits, causing the appearance of parallel bands or fringes of prismatic colors, as by the action of a grating of fine lines or bars..

Rule :: Rule (a.) A measuring instrument consisting of a graduated bar of wood, ivory, metal, or the like, which is usually marked so as to show inches and fractions of an inch, and jointed so that it may be folded compactly..

Numerator :: Numerator (n.) The term in a fraction which indicates the number of fractional units that are taken.

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..

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..

Numeric :: Numeric (n.) Any number, proper or improper fraction, or incommensurable ratio. The term also includes any imaginary expression like m + nÃ-1, where m and n are real numerics..

Argument :: Argument (n.) The quantity on which another quantity in a table depends; as, the altitude is the argument of the refraction..

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

Fractional :: Fractional (a.) Relatively small; inconsiderable; insignificant; as, a fractional part of the population..

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