Truncated /(?)/

Trun·ca·ted

Truncated

a.
  1. Cut off; cut short; maimed.
  2. Replaced, or cut off, by a plane, especially when equally inclined to the adjoining faces; as, a truncated edge. (Min.)
  3. Lacking the apex; -- said of certain spiral shells in which the apex naturally drops off. (Zool.)

Phrases & Compounds
Truncated cone
a cone or pyramid whose vertex is cut off by a plane, the plane being usually parallel to the base.