conic-section

conic section

noun Geometry.
a curve formed by the intersection of a plane with a right circular cone; an ellipse, a circle, a parabola, or a hyperbola.
Also called conic.


Origin:
1655–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
conic section
 
n
Often shortened to: conic one of a group of curves formed by the intersection of a plane and a right circular cone. It is either a circle, ellipse, parabola, or hyperbola, depending on the eccentricity, e, which is constant for a particular curve e = 0 for a circle; e1 for a hyperbola

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
conic section  
A curve formed by the intersection of a plane with a cone. Conic sections can appear as circles, ellipses, hyperbolas, or parabolas, depending on the angle of the intersecting plane relative to the cone's base.
The American Heritage® Science Dictionary
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