The Collaborative International Dictionary
Frustums
Frustum \Frus"tum\, n.; pl. L. Frusta, E. Frustums. [L. fruslum piece, bit.]
(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.
(Arch.) One of the drums of the shaft of a column.
Wiktionary
frustums
n. (plural of frustum English)