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frustum

 [fruhs-tuhm]   Origin

frus·tum

   [fruhs-tuhm]
noun, plural -tums, -ta  [-tuh] . Geometry.
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.
Origin:
1650–60; < Latin: piece, bit; probably akin to Old Irish brúid (he) breaks, Old English brȳsan to crush
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Frustum is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a chattering or flighty, light-headed person.
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Collins
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

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