ˈfrəstəm noun
also frus·trum -trəm
( plural frustums -təmz ; or frus·ta -tə ; also frustrums -trəmz ; or frus·tra -trə)
Etymology: New Latin, from Medieval Latin & Latin; Medieval Latin frustrum piece, bit, alteration of Latin frustum — more at bruise
1. : the part of a cone-shaped solid next to the base and formed by cutting off the top by a plane parallel to the base ; also : the part of a solid (as a cone or pyramid) intersected between two planes that are either parallel or sometimes inclined to each other
2. : one of the drums of the shaft of a column