An Etymological Dictionary of Astronomy and Astrophysics

A solid bounded by a plane and the surface generated by a straight line which always touches a simple closed curve on the plane and passes through a fixed point not on the plane.

Etymology (EN): L. conus “a wedge, peak, cone,” from Gk. konos “cone, spinning top, pine cone,” from PIE base *ko(n)- “to sharpen.”

Etymology (PE): Maxrut from Ar.