Definitions from Wiktionary (ellipsoid)

▸ noun:  (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.
▸ noun:  (geography) Such a surface used as a model of the shape of the earth.
▸ adjective:  Shaped like an ellipse; elliptical.
▸ adjective:  (mathematics) Of or pertaining to an ellipse; elliptic.
▸ adjective:  (botany) Having the tridimensional shape of an ellipse rotated on its long axis.
▸ Also see ellipsoid




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