frustum

Definition

A cone or pyramid whose tip has been truncated by a plane parallel to its base.

Etymology

Borrowed from Latin frustum (“morsel”).

Example Sentences

• "In a parabolic conoid this difference vaniſhes, the fruſtum being always equal to a cylinder of the ſame height upon the ſection of the conoid that biſects the altitude of the fruſtum and is parallel to its baſes."
• "This theorem holds good for complete solids as well as frustums, whether right or oblique, and not only of the solids generated from the conic sections, but also of all pyramids, cones, and in short of any solid, whose parallel sections are similar figures."
• "Come, every frustum longs to be a cone, And every vector dreams of matrices."