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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..

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..

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

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

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

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

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..

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..

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..

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..

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 /..

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

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

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

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

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..

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..

Ellipsis :: Ellipsis (n.) 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..

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

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