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What does ellipsoid mean?

Looking for the meaning or definition of the word ellipsoid? Here's what it means.

Noun
  1. (mathematics) 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.
  2. (geography) Such a surface used as a model of the shape of the earth.
Adjective
  1. Shaped like an ellipse; elliptical.
  2. (mathematics) Of or pertaining to an ellipse; elliptic.
  3. (botany) Having the tridimensional shape of an ellipse rotated on its long axis.
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