(mathematics, geometry) A surface, all of whose cross sections are elliptic or circular (including the sphere), that generalises the ellipse and in Cartesian coordinates (x, y, z) is a quadric with equation x²/a² + y²/b² + z²/c² = 1.

Shaped like an ellipse; elliptical. / (mathematics) Of or pertaining to an ellipse; elliptic. / (botany) Having the tridimensional shape of an ellipse rotated on its long axis.

Alternative form of ellipsoid / (mathematics) Of or pertaining to an ellipsoid.

plural of ellipsoid

In an ellipsoidal manner / In the form of an ellipsoid

(geometry) A spheroid; a solid of revolution generated by rotating an ellipse about one of its axes.

plural of ellipsoid of revolution

plural of Jacobi ellipsoid

A triaxial ellipsoid under hydrostatic equilibrium.