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Definition of: ellipse
(i·lips′) noun Geom.
1. A plane curve such that the sum of the distances from any point of the curve to two fixed points, called foci, is a constant.
2. A conic section. [<L ellipsis. See ELLIPSIS.]
A–A′ Major axis, B–B′ Minor axis.
F, F′ Foci. P, P′ Points on curve.
FP+ PF′ = FP′+ P′F′
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