n.;
Regular hexahedron,
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. [ 1913 Webster ]
n. [ Gr. &unr_; four times + E. hexahedron. ] (Crystallog.) A tetrahexahedron. [ 1913 Webster ]