What is "tetrahexahedron"

Tetrahexahedron \Tet`ra*hex`a*he"dron\, n. [Tetra- + hexahedron.] (Crystallog.) A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube.

n. (context crystallography English) A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube.