Meaning of frustum

frus•tum

Pronunciation: (frus'tum), [key]
— pl. -tums, -ta
  1. the part of a conical solid left after cutting off a top portion with a plane parallel to the base.
  2. the part of a solid, as a cone or pyramid, between two usually parallel cutting planes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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