Word: ellipsoid
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 = 0.
Such a surface used as a model of the shape of the earth. Example: Here the geoid is thirty meters below the ellipsoid.
Shaped like an ellipse; elliptical.
Of or pertaining to an ellipse; elliptic.
Having the tridimensional shape of an ellipse rotated on its long axis.
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