Etymology
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ellipse (n.)

1753, from French ellipse (17c.), from Latin ellipsis "ellipse," also, "a falling short, deficit," from Greek elleipsis (see ellipsis). So called because the conic section of the cutting plane makes a smaller angle with the base than does the side of the cone, hence, a "falling short." The Greek word was first applied by Apollonius of Perga (3c. B.C.E.). to the curve which previously had been called the section of the acute-angled cone, but the word earlier had been technically applied to a rectangle one of whose sides coincides with a part of a given line (Euclid, VI. 27).

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Definitions of ellipse

ellipse (n.)
a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it;
the sums of the distances from the foci to any point on an ellipse is constant
Synonyms: oval
From wordnet.princeton.edu