Frustum meaning

frŭs'təm
The part of a solid, such as a cone or pyramid, between two parallel planes cutting the solid, especially the section between the base and a plane parallel to the base.
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A solid figure consisting of the bottom part of a cone or pyramid, the top of which has been cut off by a plane parallel to the base.
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The part of a solid figure contained between two parallel planes.
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A cone or pyramid whose tip has been truncated by a plane parallel to its base.
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A region of a sphere delimited by two parallel planes.
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Origin of frustum

Latin frūstum piece broken off