a. [ Holo- + Gr. &unr_; seat, base, fr. &unr_; to sit. ] (Crystallog.) Having all the planes required by complete symmetry, -- in opposition to hemihedral. [ 1913 Webster ]
{ } a. [ See Polyhedron. ] (Geom.) Having many sides, as a solid body. [ 1913 Webster ]
Polyhedral angle, an angle bounded by three or more plane angles having a common vertex. [ 1913 Webster ]