frustum

play
noun frus·tum \ˈfrə-stəm\

Definition of frustum

plural

frustums

or

frusta

play \ˈfrə-stə\
  1. :  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

Origin and Etymology of frustum

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


First Known Use: 1658

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a rounded knoll or a ridge of ice

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