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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..

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

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

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

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

Ellipses :: Ellipses (pl. ) of Ellipsi.

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.

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..

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..

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..

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

Ellipsis :: Ellipsis (n.) An ellipse.

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

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..

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..

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

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..

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

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