A frustum is the portion of a solid – normally a cone or pyramid – which lies between two parallelplanes cutting the solid. Degenerate cases are obtained for finite solids by cutting with a single plane only.
An example of a pyramidal frustum may be seen on the reverse of the Great Seal of the United States, as on the back of the U.S. one dollar bill. The "unfinished pyramid" is surmounted by the "eye of providence".
Certain ancient Native American mounds also take on the frustum of a pyramid.
afgeknotte kegel (conical frustrum, conical frustum, frustrum of a cone, frustum, frustum of a cone, truncated cone).
tronc de cône (conical frustrum, conical frustum, frustrum of a cone, frustum, frustum of a cone), cône tronqué (conical frustrum, conical frustum, frustrum of a cone, frustum, frustum of a cone).
Kegelstumpf (conical frustrum, conical frustum, frustrum of a cone, frustum, frustum of a cone, truncated cone), abgestumpfter Kegel (conical frustrum, conical frustum, frustrum of a cone, frustum, frustum of a cone, truncated cone).
afgeknotte kegel (conical frustrum, conical frustum, frustrum, frustum, frustum of a cone, truncated cone).
tronc de cône (conical frustrum, conical frustum, frustrum, frustum, frustum of a cone), cône tronqué (conical frustrum, conical frustum, frustrum, frustum, frustum of a cone).
Kegelstumpf (conical frustrum, conical frustum, frustrum, frustum, frustum of a cone, truncated cone), abgestumpfter Kegel (conical frustrum, conical frustum, frustrum, frustum, frustum of a cone, truncated cone).
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