(redirected from Eliptical)
Also found in: Dictionary, Thesaurus, Medical.


closed plane curve consisting of all points for which the sum of the distances between a point on the curve and two fixed points (foci) is the same. It is the conic sectionconic section
or conic
, curve formed by the intersection of a plane and a right circular cone (conical surface). The ordinary conic sections are the circle, the ellipse, the parabola, and the hyperbola.
..... Click the link for more information.
 formed by a plane cutting all the elements of the cone in the same nappe. The center of an ellipse is the point halfway between its foci. The major axis is the chord that passes through the foci. The minor axis is the chord that passes through the center perpendicular to the major axis. The latus rectum is the chord through either focus perpendicular to the major axis. The vertices are the two points of intersection of the major axis with the curve. The eccentricity of an ellipse, a ratio of two lengths, is a measure of its flatness; it is the distance from the center to either focus divided by the distance from the center to either vertex. The circlecircle,
closed plane curve consisting of all points at a given distance from some fixed point, called the center. A circle is a conic section cut by a plane perpendicular to the axis of the cone.
..... Click the link for more information.
 may be considered an ellipse of eccentricity zero, i.e., one in which the center and the two foci all coincide.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/


A closed curve that is a type of conic section with an eccentricity less than one. The longest line that can be drawn through the center of an ellipse is the major axis whereas the shortest line is the minor axis. The two axes are at right angles. There are two foci, which lie on the major axis and are symmetrically positioned on opposite sides of the center. The sum of the distances from the foci to a point moving round the ellipse is constant and equal to the length of the major axis. An orbiting body moves in an ellipse with the primary at one of the foci. See also Kepler's laws; orbit.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006


A closed loop obtained by cutting a right circular cone by a plane.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the intersection of a plane and one of the nappes of a circular conical surface (Figure 1).

Figure 1

An ellipse may also be defined as the locus of points M in the plane for which the sum of the distances from two fixed points F1 and F2 in the plane is constant; F1 and F2 are known as the foci of the ellipse. If a system of coordinates xOy is chosen as shown in Figure 2, then the equation of the ellipse assumes the form

Here, OF1 = OF2 = c, 2a = F1M + F2M, and Ellipse.

Figure 2

An ellipse is a quadratic curve. It is symmetric with respect to its axes AB and CD, and its center O is its center of symmetry. The line segments AB = 2a and CD = 2b are called the major and minor axes of the ellipse, respectively. The number e = cla < 1 is known as the eccentricity of the ellipse; if a = b, then e = 0 and the ellipse is a circle. The lines whose equations are x = –a/e and x = a/e are called the directrices of the ellipse; the ratio of the distance of a point of the ellipse from the nearest focus and the distance of the point from the nearest directrix is constant and equal to the eccentricity. The points A and B where the ellipse intersects its major axis are called its vertices. (See alsoCONIC SECTION.)

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


The locus of all points in the plane at which the sum of the distances from a fixed pair of points, the foci, is a given constant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a closed conic section shaped like a flattened circle and formed by an inclined plane that does not cut the base of the cone. Standard equation x2/a2 + y2/b2 = 1, where 2a and 2b are the lengths of the major and minor axes. Area: πab
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
In Buteo magnirostris, this cell present itself predominantly eliptical, but ocasionally spherical or oval with slyghtly indented nucleus in one or both ends and in general following the shape of the cell.
where l is geometrical parametr of cracks (for eliptical cracks l = [pi] / 2), [F.sub.1] and [F.sub.2] are eigenvalues of second rank crack tensor, [alpha] is the angle between direction of wave propagation and longer axis of crack tensor.
The distinctive wedge shape is complemented by a wider grille, cat-like eliptical headlamps and the distinctive three-pronged star on the boot.
Right, The Library of Birmingham in the setting of an extended Park Street Gardens, which forms the western end of the new park.; An overview of the park site, with the Richard Rogers Partnership's eliptical Library of Birmingham to the right and Park Street and the redeveloped Masshouse Circus to the left.
The styling is very European, but has a dynamic look with curves and power bulges all set off by honeycomb grille and trim and smart, eliptical headlamps.
In a report, Senior Police Officer 4 Henry Se of QC Traffic-Sector 3, said the accident transpired along Eliptical Road in Quezon City around 11 p.m., involving a CemTrans Inc.
There may be better-looking vehicles around, but the Subaru definitely has a presence with its large eliptical headlights, power scoops and huge front and rear doors as well as its high ground clearance.
While the Octavia design has been around for a while, it still has a simple but elegant look, with sculpted bumper and wings and large eliptical headlamps.
The pipe and slippers image has now been firmly consigned to the dustbin of history with aggressive, coupe-like styling that features a huge new grille and eliptical, feline headlights, darkened rear windows and huge panoramic roof.
It is a nice-looking car, featuring the shark-like I front grille and eliptical headlights common to other Peugeots.
The lipstick looks more like a small space probe and it's eliptical mirror, handily inlaid on the lid means you'll never have to wing-it when you're refreshing your bouche.
While the Octavia design has been around for a while and is hardly a show stopper, it still has a simple, but elegant look with sculpted bumper and wings and large eliptical head lamps, while the interior boasts the same high quality fixtures and fittings you get from parent company VW.