Word:   
Definitions of ellipse:
  • noun:   a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
    Example: "The sums of the distances from the foci to any point on an ellipse is constant"

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Search for ellipse at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See ellipse used in context: several books and articles.

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