frustum

noun
frus·​tum | \ˈfrə-stəm \
plural frustums or frusta\ ˈfrə-​stə \

Definition of frustum 

: 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

First Known Use of frustum

1658, in the meaning defined above

History and Etymology for frustum

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

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The first known use of frustum was in 1658

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