ellipsoid

el·lip·soid Audio Help (ĭ-lĭp'soid')

n. A geometric surface, all of whose plane sections are either ellipses or circles.
el·lip'soid', el·lip'soi'dal (ĭ-lĭp'soid'l, ěl'ĭp-, ē'lĭp-) adj.

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