# ellipse

[ih-lips]

### noun Geometry.

a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. Typical equation: (x2/a2) + (y2/b2) = 1. If a = b the ellipse is a circle.

## Origin of ellipse

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Related Words for ellipse

trajectory, rotation, pattern, path, arc, arch, contour, loop, apogee, track, curve, course, circle, locus, lap, round, cycle, perigee, ellipse, swerve## Examples from the Web for ellipse

### Contemporary Examples of ellipse

### Historical Examples of ellipse

These marks will then represent the diameter of the ellipse across its major axis.

Practical Mechanics for BoysJ. S. Zerbe

It is not allowed to move exactly in an ellipse, nor is the earth exactly in the focus.

Great AstronomersR. S. Ball

Now it is remarkable that this apparent path is still an ellipse.

Great AstronomersR. S. Ball

These points are your centers for scribing the long sides of the ellipse.

Carpentry for BoysJ. S. Zerbe

The other two being intersected at an angle, will each be an ellipse.

The Theory and Practice of PerspectiveGeorge Adolphus Storey

## ellipse

### noun

## Word Origin for ellipse

C18: back formation from ellipsis

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Online Etymology Dictionary, © 2010 Douglas Harper

## ellipse

[ĭ-lĭps′]

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## ellipse

[(i-lips)]

## Note

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.