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Hyperbola :: Hyperbola (n.) A curve formed by a section of a cone, when the cutting plane makes a greater angle with the base than the side of the cone makes. It is a plane curve such that the difference of the distances from any point of it to two fixed points, called foci, is equal to a given distance. See Focus. If the cutting plane be produced so as to cut the opposite cone, another curve will be formed, which is also an hyperbola. Both curves are regarded as branches of the same hyperbola. See Illust. o

Chaetognatha :: Chaetognatha (n. pl.) An order of free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head..

Trajectory :: Trajectory (n.) The curve which a body describes in space, as a planet or comet in its orbit, or stone thrown upward obliquely in the air..

Stem-winder :: Stemson (n.) A piece of curved timber bolted to the stem, keelson, and apron in a ship's frame near the bow..

Riffler :: Riffler (n.) A curved file used in carving wool and marble.

Witch :: Witch (n.) A certain curve of the third order, described by Maria Agnesi under the name versiera..

Embow :: Embow (v. t.) To bend like a bow; to curve.

Plane :: Plane (a.) An ideal surface, conceived as coinciding with, or containing, some designated astronomical line, circle, or other curve; as, the plane of an orbit; the plane of the ecliptic, or of the equator..

Conics :: Conics (n.) That branch of geometry which treats of the cone and the curves which arise from its sections.

Concave :: Concave (a.) Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky..

Evolvent :: Evolvent (n.) The involute of a curve. See Involute, and Evolute..

Helicoid :: Helicoid (a.) Spiral; curved, like the spire of a univalve shell..

Quadrinodal :: Quadrinodal (a.) Possessing four nodes; as, quadrinodal curves..

Quadrature :: Quadrature (a.) The integral used in obtaining the area bounded by a curve; hence, the definite integral of the product of any function of one variable into the differential of that variable..

Coordinate :: Coordinate (n.) Lines, or other elements of reference, by means of which the position of any point, as of a curve, is defined with respect to certain fixed lines, or planes, called coordinate axes and coordinate planes. See Abscissa..

Polycrotic :: Polycrotic (a.) Of or pertaining to polycrotism; manifesting polycrotism; as, a polycrotic pulse; a polycrotic pulse curve..

Retort :: Retort (v. t.) A vessel in which substances are subjected to distillation or decomposition by heat. It is made of different forms and materials for different uses, as a bulb of glass with a curved beak to enter a receiver for general chemical operations, or a cylinder or semicylinder of cast iron for the manufacture of gas in gas works..

Tautochrone :: Tautochrone (n.) A curved line, such that a heavy body, descending along it by the action of gravity, will always arrive at the lowest point in the same time, wherever in the curve it may begin to fall; as, an inverted cycloid with its base horizontal is a tautochrone..

Curvant :: Curvant (p. pr.) Bowed; bent; curved.

Gauche :: Gauche (n.) Winding; twisted; warped; -- applied to curves and surfaces.

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