superellipse

/S UW1 P ER0 EH1 L AH0 P S/
noun
  1. 1

    (algebra, geometry) a geometric shape constituting a transition between a rectangle and a circle; a closed curve, of which the circle and ellipse are special cases, whose parametric equation is x = a.cos^(2/r)t, y = b.cos^(2/r)t

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