noun, plural frustums, frusta [fruhs-tuh] . Geometry.
the part of a conical solid left after cutting off a top portion with a plane parallel to the base.
the part of a solid, as a cone or pyramid, between two usually parallel cutting planes.

1650–60; < Latin: piece, bit; probably akin to Old Irish brúid (he) breaks, Old English brȳsan to crush Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frustum (ˈfrʌstəm)
n , pl -tums, -ta
1.  geometry
 a.  the part of a solid, such as a cone or pyramid, contained between the base and a plane parallel to the base that intersects the solid
 b.  the part of such a solid contained between two parallel planes intersecting the solid
2.  architect a single drum of a column or a single stone used to construct a pier
[C17: from Latin: piece; probably related to Old English brӯsan to crush, bruise]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1650s, from L. frustum "piece broken off."
Online Etymology Dictionary, © 2010 Douglas Harper
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