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[fruhs-tuh m] /ˈfrʌs təm/
noun, plural frustums, frusta
[fruhs-tuh] /ˈfrʌs tə/ (Show IPA).
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.
Origin of frustum
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. 2015.
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Examples from the web for frustum
  • The bore-hole is not a true cylinder, but the frustum of an elongated cone.
  • Both these factors the form of a frustum of a paraboloid, then the equations can affect displacement.
  • The outer shell forms the hollow frustum of an octagonal pyramid while the inner one is the hollow frustum of a cone.
  • The rod was at the axis of symmetry of the conic frustum.
British Dictionary definitions for frustum


noun (pl) -tums, -ta (-tə)
  1. 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
  2. the part of such a solid contained between two parallel planes intersecting the solid
(architect) a single drum of a column or a single stone used to construct a pier
Word Origin
C17: from Latin: piece; probably related to Old English brӯsan to crush, bruise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for frustum

1650s, from Latin frustum "piece broken off," from PIE *bhrus-to-, from root *bhreu- "to cut, break up."

Online Etymology Dictionary, © 2010 Douglas Harper
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