Früs'tum, n.

n.; pl. FRÜS'TA, or FRÜS'-TUMS. [Lat. frustum, piece, bit; It. frusto.] (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, &c., between two planes, which may be either parallel or inclined to each other.