截顶锥
截头圆锥体
截锥体

[ noun ]
a frustum formed from a cone
<noun.shape>

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