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cabochon a polished gemstone, usu. in the form of a circle or ellipse, without facets. [1/2 definitions]
conic section in geometry, a curve, such as an ellipse, hyperbola, or parabola, created by the intersection of a plane and a right circular cone.
elliptical of, pertaining to, or in the form of an ellipse. [1/4 definitions]
oblong having one dimension longer than the other, as in a rectangle or ellipse; elongated. [1/2 definitions]
oval something shaped like an egg or ellipse. [1/3 definitions]
spheroid a flattened sphere created by revolving an ellipse about one of its axes.
torus a semicircular surface, or rounded ridge, or the solid it encloses, such as the convex molding surrounding the base of a column or the doughnut-shaped figure generated, in geometry, by a circle or an ellipse.