frustum noun. ['frʌstǝm] Pl. -stums, -sta [-stǝ]. Also frustrum ['frʌstrǝm]. M17.
[Latin = piece cut off.]
1. Math. The portion of a solid figure which remains after the upper part has been cut off by a plane parallel to the base, or which is intercepted between two planes. M17.

2. gen. A fragment or portion. rare. E18.

[TahlilGaran] English Dictionary ▲