Definition of frustum in English:


Line breaks: frus|tum
Pronunciation: /ˈfrʌstəm

noun (plural frusta /-tə/ 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.
    More 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'.

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Pronunciation: kərf
a slit made by cutting with a saw