Meaning of trihedral

tri•he•dral

Pronunciation: (trī-hē'drul), [key]
— adj. Geom.
  1. having, or formed by, three planes meeting in a point: a trihedral angle.
—n.
  1. a trihedron.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.