Webster's English Dictionary

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ellipse

el.lipse \i-'lips, e-\ n [Gk elleipsis] 1a: OVAL  1b: a closed plane curve 
   generated by a point moving in such a way that the  sums of its distances 
   from two fixed points is a constant : a plane section of a right circular 
   cone that is a closed curve 2: ELLIPSIS