N-ellipse
GENERALIZATION OF THE ELLIPSE ALLOWING MORE THAN TWO FOCI
K-ellipse; Polyellipse; Egglipse; Multifocal ellipse
In geometry, the -ellipse is a generalization of the ellipse allowing more than two foci. -ellipses go by numerous other names, including multifocal ellipse, polyellipse, egglipse, -ellipse, and Tschirnhaus'sche Eikurve (after Ehrenfried Walther von Tschirnhaus).