Cone

n. [Fr. cone, It. & Sp. cono, Lat. conus, Gr. κῶνος, from Skr. çu, to bring to a point.]

1. A solid body generated by the revolution of a triangle about one of its sides, having a circle for its base, and its top terminated in a point or vertex.
2. (Bot.) The conical fruit of several evergreen trees, as of the pine, fir, cedar, and cypress. It is composed of woody scales, each one of which has a seed at its base.
3. (Conch.) A shell of the genus Conus, having a conical form.

Cone of rays (Opt.), the pencil of rays of light which proceed from a radiant point to a given surface, as that of a lens. — Oblique or scalene cone, a cone of which the axis is inclined to the plane of its base, and its sides unequal. — Right cone, a cone of which the axis is perpendicular to the plane of its base, and its sides equal.