from
The Collaborative International Dictionary of English v.0.48
Truncated \Trun"ca*ted\, a.
1. Cut off; cut short; maimed.
[1913 Webster]
2. (Min.) Replaced, or cut off, by a plane, especially when
equally inclined to the adjoining faces; as, a truncated
edge.
[1913 Webster]
3. (Zool.) Lacking the apex; -- said of certain spiral shells
in which the apex naturally drops off.
[1913 Webster]
{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.
[1913 Webster]