DICT.TW Dictionary Taiwan

 frus·tum /ˈfrʌstəm/
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 Frus·tum n.; pl. L. Frusta E. Frustums
 1. Geom. The part of a solid next the base, formed by cutting off the, top; or the part of any solid, as of a cone, pyramid, etc., between two planes, which may be either parallel or inclined to each other.
 2. Arch. One of the drums of the shaft of a column.
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 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
      [also: frusta (pl)]