Definition of frustum in English:

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Pronunciation: /ˈfrʌstəm/

noun (plural frusta /ˈfrʌstə/ or frustums)

The portion of a cone or pyramid which remains after its upper part has been cut off by a plane parallel to its base, or which is intercepted between two such planes.
Example sentences
  • An assessment task may ask students to devise a plan for determining the volume of the frustum of a pyramid (a task not previously considered in class).
  • They only appear as frustums because they are being viewed at from an angle.
  • Depending mainly on the thicknesses of the members, the midplane splits one of the two members into two frusta, thus making a total of three frusta to analyse.


Mid 17th century: from Latin, 'piece cut off'.

For editors and proofreaders

Line breaks: frus|tum

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