Ellipse
[ɪlˈɪps], [ɪlˈɪps], [ɪ_l_ˈɪ_p_s]
Definitions of ellipse

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"

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.

The elliptical orbit of a planet.

A curve that is longer than it is wide; one of the conic sections, or curves formed by cutting a cone.

An oval figure.
Usage examples for ellipse

Moreover, when a planet possesses a satellite, it is not the centre of the planet which ever attempts to describe the Keplerian ellipse, but it is the common centre of gravity of the two bodies. – Pioneers of Science by Oliver Lodge

In the first place, on taking a careful tracing of this piece of the edge, I found that its curve was part of an ellipse; but watch glasses, nowadays, are invariably circular. – The Mystery of 31 New Inn by R. Austin Freeman

" A planet's orbit" " An ellipse." – The Holes Around Mars by Jerome Bixby

The fact that in almost every visual aspect the base line is that of an ellipse, not a circle, comes as a surprise to people unaccustomed to drawing. – The Practice and Science Of Drawing by Harold Speed

The leading driver of each column would set the curving track which would bring the wagons into a great ellipse or a circle while moving in the two column formation. – Bring Me His Ears by Clarence E. Mulford

It seems most improbable that with two out of three significant words the same, the ellipse should be supplied by anything but the third. – The Expositor's Bible: Colossians and Philemon by Alexander Maclaren

The scientist observing the path of a planet travelling round the sun, finds that its course is that of an ellipse. – Rudolph Eucken by Abel J. Jones

It follows that rays from a source of light at one focus are reflected by an ellipse to the other. – An Elementary Course in Synthetic Projective Geometry by Lehmer, Derrick Norman

Some such teasing notion of their mystical affinity is what haunts you as you make your round of the vast ellipse, with the well groomed men about you and the well groomed horses beyond the barrier. – Short Stories and Essays From "Literature and Life" by William Dean Howells

Three hundred yards above the bridge, the creek walls open in an ellipse, narrowing abruptly where the bridge spans them. – Laramie Holds the Range by Frank H. Spearman

Suppose, say, that a certain penny appears in a number of different perspectives; in some it looks larger and in some smaller, in some it looks circular, in others it presents the appearance of an ellipse of varying eccentricity. – Mysticism and Logic and Other Essays by Bertrand Russell

The section inclosed within these limits is in shape somewhat like an ellipse. – School History of North Carolina by John W. Moore

We made an almost complete ellipse around and down, and rode at last over dry dung at the bottom, into which the donkeys' feet sank as into a three pile carpet. – Jimgrim and Allah's Peace by Talbot Mundy

The chiefs sat in a long ellipse in the central part of the house, some sitting erect with legs crossed, others half reclining, while a few lay sprawling, their chins resting on their hands. – The Road to Frontenac by Samuel Merwin

With radius q s and from q draw the ellipse from s to w. – Modern MachineShop Practice, Volumes I and II by Joshua Rose

To which Newton at once replied, " An ellipse." – Pioneers of Science by Oliver Lodge