Definition of frustum in English:


Syllabification: frus·tum
Pronunciation: /ˈfrəstəm

noun (plural frusta /-tə/ or frustums)

  • The portion of a cone or pyramid that remains after its upper part has been cut off by a plane parallel to its base, or that 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'.

More definitions of frustum

Definition of frustum in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day kerf
Pronunciation: kərf
a slit made by cutting with a saw