TETRAHEDRAL

tetrahedral. Tetrahedral, a. having four equal sides

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Tet′ra‐he″dral (?), a. [[See Tetrahedron.]] 1. 1. Having, or composed of, four sides.
2. 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.