Category:Tetrahedral

Tet`ra*he"dral, a. Etym: [see tetrahedron.]

1. Having, or composed of, four sides.

2. (crystallog.) (a) having the form of the regular tetrahedron. (b) pertaining or related to a tetrahedron, or to the system of Hemihedral forms to which the tetrahedron belongs. Tetrahedral angle (geom.), a solid angle bounded or inclosed by four plane angles.