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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..

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

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

Ellipsis :: Ellipsis (n.) 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..

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..

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..

Ellipses :: Ellipses (pl. ) of Ellipsi.

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

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

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..

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

Parameter :: Parameter (n.) Specifically (Conic Sections), in the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate..

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..

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..

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..

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

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 /..

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

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