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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..

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..

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

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..

Ellipsis :: Ellipsis (n.) An ellipse.

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

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..

Elliptical :: Elliptical (a.) Of or pertaining to an ellipse; having the form of an ellipse; oblong, with rounded ends..

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..

Oval :: Oval (n.) A body or figure in the shape of an egg, or popularly, of an ellipse..

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

Ellipses :: Ellipses (pl. ) of Ellipsi.

Ellipsograph :: Ellipsograph (n.) An instrument for describing ellipses; -- called also trammel.

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..

Oblatum :: Oblatum (n.) An oblate spheroid; a figure described by the revolution of an ellipse about its minor axis. Cf. Oblongum.

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..

Ellipse :: Ellipse (n.) The elliptical orbit of a planet.

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 /..

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

Ellipsoid :: Ellipsoid (n.) A solid, all plane sections of which are ellipses or circles. See Conoid, n., 2 (a)..

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