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Eccentricity :: Eccentricity (n.) The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis.

Trammel :: Trammel (n.) An instrument for drawing ellipses, one part of which consists of a cross with two grooves at right angles to each other, the other being a beam carrying two pins (which slide in those grooves), and also the describing pencil..

Revolution :: Revolution (n.) Return to a point before occupied, or to a point relatively the same; a rolling back; return; as, revolution in an ellipse or spiral..

Round :: Round (a.) Having a curved outline or form; especially, one like the arc of a circle or an ellipse, or a portion of the surface of a sphere; rotund; bulging; protuberant; not angular or pointed; as, a round arch; round hills..

Project :: Project (v. t.) To draw or exhibit, as the form of anything; to delineate; as, to project a sphere, a map, an ellipse, and the like; -- sometimes with on, upon, into, etc.; as, to project a line or point upon a plane. See Projection, 4..

Umbilicus :: Umbilicus (n.) One of foci of an ellipse, or other curve..

Elliptically :: Elliptically (adv.) In the form of an ellipse.

Colligation :: Colligation (n.) That process by which a number of isolated facts are brought under one conception, or summed up in a general proposition, as when Kepler discovered that the various observed positions of the planet Mars were points in an ellipse..

Arc :: Arc (n.) A portion of a curved line; as, the arc of a circle or of an ellipse..

Spheroid :: Spheroid (n.) A body or figure approaching to a sphere, but not perfectly spherical; esp., a solid generated by the revolution of an ellipse about one of its axes..

Ellipse :: Ellipse (n.) An oval or oblong figure, bounded by a regular curve, which corresponds to an oblique projection of a circle, or an oblique section of a cone through its opposite sides. The greatest diameter of the ellipse is the major axis, and the least diameter is the minor axis. See Conic section, under Conic, and cf. Focus..

Ellipses :: Ellipses (pl. ) of Ellipsi.

Ellipse :: Ellipse (n.) Omission. See Ellipsis.

Indicatrix :: Indicatrix (n.) A certain conic section supposed to be drawn in the tangent plane to any surface, and used to determine the accidents of curvature of the surface at the point of contact. The curve is similar to the intersection of the surface with a parallel to the tangent plane and indefinitely near it. It is an ellipse when the curvature is synclastic, and an hyperbola when the curvature is anticlastic..

Eccentric :: Eccentric (a.) Not having the same center; -- said of circles, ellipses, spheres, etc., which, though coinciding, either in whole or in part, as to area or volume, have not the same center; -- opposed to concentric..

Transverse :: Transverse (n.) The longer, or transverse, axis of an ellipse..

Oblongum :: Oblongum (n.) A prolate spheroid; a figure described by the revolution of an ellipse about its greater axis. Cf. Oblatum, and see Ellipsoid of revolution, under Ellipsoid..

Periphery :: Periphery (n.) The circumference of a circle, ellipse, or other figure..

Ellipsis :: Ellipsis (n.) An ellipse.

Ellipticity :: Ellipticity (n.) Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the ellipticity of the earth is /..

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