frustum

American  

[fruhs-tuhm] / ˈfrʌs təm /

noun

Geometry.

frustums, plural frusta plural

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.

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frustum British  

/ ˈfrʌstəm /

noun

1. geometry

   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

2. architect a single drum of a column or a single stone used to construct a pier

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Etymology

Origin of frustum

1650–60; < Latin: piece, bit; probably akin to Old Irish brúid (he) breaks, Old English brȳsan to crush

Example Sentences

Frustum, frus′tum, n. a slice of a solid body: the part of a cone which remains when the top is cut off by a plane parallel to the base.

From Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) by Various