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frustum

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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; < L: piece, bit; prob. akin to OIr brúid (he) breaks, OE brȳsan to crush
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Based on the Random House Dictionary, © Random House, Inc. 2010.
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frus·tum   (frŭs'təm)   


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n.   pl. frus·tums or frus·ta (-tə) Mathematics
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.

[Latin frūstum, piece broken off.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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