Etymology
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frustum (n.)

"remaining piece after a part has been cut off," 1650s, in mathematics, from Latin frustum "piece broken off," from PIE *bhrus-to-, from root *bhreu- "to cut, break up" (see bruise (v.)).

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Definitions of frustum

frustum (n.)
a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed;
From wordnet.princeton.edu