ellipse

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We must also remember that the ellipse is an oblique projection of a circle, or an oblique section of a cone.

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Definitions (13)

Toggle American Heritage definitions American Heritage Dictionary (4)

  1. noun A plane curve, especially:
  2. noun A conic section whose plane is not parallel to the axis, base, or generatrix of the intersected cone.
  3. noun The locus of points for which the sum of the distances from each point to two fixed points is equal.

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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. French, from Latin ellīpsis, from Greek elleipsis, a falling short, ellipse, from elleipein, to fall short (from the relationship between the line joining the vertices of a conic and the line through the focus and parallel to the directrix of a conic) : en-, in; see en-2 + leipein, to leave; see leikw- in Indo-European roots.

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  1. = D. Swedish ellips = G. Danish ellipse = French ellipse = Spanish elipse = Portuguese ellipse = Italian ellisse, elisse, ellipse, from Latin ellipsis, a want, defect, an ellipse, from Greek ε=λλειψις, a leaving out, ellipsis in grammar, a falling short, the conic section ellipse (see def.), from ἐλλείπειν, leave in, leave behind, omit, intransitive fall short, from ἐν, in, + λείπειν, leave. Cf. ellipsis.
 

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/ɛˈlɪps/
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