资料来源 : Webster's Revised Unabridged Dictionary (1913)

Truncated \Trun"ca*ted\, a.
   1. Cut off; cut short; maimed.

   2. (Min.) Replaced, or cut off, by a plane, especially when
      equally inclined to the adjoining faces; as, a truncated
      edge.

   3. (Zo["o]l.) Lacking the apex; -- said of certain spiral
      shells in which the apex naturally drops off.

   {Truncated cone} or {pyramid} (Geom.), a cone or pyramid
      whose vertex is cut off by a plane, the plane being
      usually parallel to the base.

资料来源 : WordNet®

truncated cone
     n : a frustum formed from a cone