frustum

noun

frus·​tum ˈfrə-stəm How to pronounce frustum (audio)
plural frustums or frusta ˈfrə-stə How to pronounce frustum (audio)
: the basal part of a solid cone or pyramid formed by cutting off the top by a plane parallel to the base
also : the part of a solid intersected between two usually parallel planes

Examples of frustum in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The formula for the volume of a truncated pyramid (one with its top lopped off, also known as a frustum) is an order of magnitude more sophisticated. Cody Cottier, Discover Magazine, 3 Dec. 2024 The case of the 24-Seconde Architecture is shaped like a convex conical frustum. Carol Besler, Robb Report, 5 July 2022 The EmDrive test device used by White and his colleagues was a copper frustum—a cone with its top lopped off—that was just under a foot long. Daniel Oberhaus, Wired, 8 May 2020

Word History

Etymology

New Latin, from Latin, piece, bit — more at bruise entry 2

First Known Use

1658, in the meaning defined above

Time Traveler
The first known use of frustum was in 1658

Dictionary Entries Near frustum

Cite this Entry

“Frustum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/frustum. Accessed 21 Dec. 2024.

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