ellipse
/ɪˈlɪps/ noun C2- A closed curve, the locus of a point such that the sum of the distances from that point to two other fixed points (called the foci of the ellipse) is constant; equivalently, the conic section that is the intersection of a cone with a plane that does not intersect the base of the cone. · Near-synonym: oval (synonymous in non-technical use)
Plural ellipses
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Well, by means of these lines, which are in accordance with the double motion of the earth, and the ellipse it describes round the sun, I am enabled to ascertain the precise hour with more minuteness than if I possessed a watch; for that might be broken or deranged in its movements, while the sun and earth never vary in their appointed paths.”
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