Last Updated
：2025/11/21
ellipsoid
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（ plural ）
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(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.
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ellipsoid
To demonstrate the properties of quadric surfaces, the mathematician sketched an ellipsoid on the board and showed how its cross sections are ellipses.
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To demonstrate the properties of quadric surfaces, the mathematician sketched an ellipsoid on the board and showed how its cross sections are ellipses.
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