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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..

Elliptically :: Elliptically (adv.) In the form 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..

Ellipses :: Ellipses (pl. ) of Ellipsi.

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 /..

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..

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.

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

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

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..

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

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

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..

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..

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..

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

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

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