(Crystallog.) A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube.
tetrahexahedron
enUK
tetrahexahedron
[‚te·trə′hek·sə‚drän] (crystallography) A form of regular crystal system with four triangular isosceles faces on each side of a cube; there are altogether 24 congruent faces.