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elliptic coordinates[ə′lip·tik kō′ȯrd·ən·əts]
The coordinates of a point in the plane determined by confocal ellipses and hyperbolas.
coordinates associated with a family of confocal ellipses and hyperbolas. The relation between the elliptic coordinates of a point M and its Cartesian coordinates x and y is give by the equations x = c cosh u cos v and y = c sinh u sin v.