polyhedral angle

from WordNet (r) 3.0 (2006)

polyhedral angle
    n 1: the space enclosed by three or more planes that intersect
         in a vertex

from The Collaborative International Dictionary of English v.0.48

Polyhedral \Pol`y*he"dral\, Polyhedrical \Pol`y*hed"ric*al\, 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]