- Conic section
- Conic Con"ic, Conical Con"ic*al, a. [Gr. ?: cf. F. conique.
See {Cone}.]
1. Having the form of, or resembling, a geometrical cone;
round and tapering to a point, or gradually lessening in
circumference; as, a conic or conical figure; a conical
vessel.
[1913 Webster]
2. Of or pertaining to a cone; as, conic sections. [1913 Webster]

{Conic section} (Geom.), a curved line formed by the intersection of the surface of a right cone and a plane. The conic sections are the parabola, ellipse, and hyperbola. The right lines and the circle which result from certain positions of the plane are sometimes, though not generally included.

{Conic sections}, that branch of geometry which treats of the parabola, ellipse, and hyperbola.

{Conical pendulum}. See {Pendulum}.

{Conical projection}, a method of delineating the surface of a sphere upon a plane surface as if projected upon the surface of a cone; -- much used by makers of maps in Europe.

{Conical surface} (Geom.), a surface described by a right line moving along any curve and always passing through a fixed point that is not in the plane of that curve. [1913 Webster]

*The Collaborative International Dictionary of English.
2000.*