GNU Collaborative International Dictionary of English

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1.       
   Ellipse , n. [Gr. ἔλλειψις, prop., a defect, the inclination of the ellipse to the base of the cone being in defect when compared with that of the side to the base: cf. F. ellipse. See Ellipsis.]
   (Geom.) An oval or oblong figure, bounded by a regular curve, which corresponds to an oblique projection of a circle, or an oblique section of a cone through its opposite sides. The greatest diameter of the ellipse is the major axis, and the least diameter is the minor axis. See Conic section, under Conic, and cf. Focus.
   1913 Webster
   (Gram.) Omission. See Ellipsis.
   1913 Webster
   The elliptical orbit of a planet.
   1913 Webster
   The Sun flies forward to his brother Sun;
   The dark Earth follows wheeled in her ellipse.
   Tennyson.
   
   1913 Webster