Dihedral
Pronunciation : Di*he"dral
Part of Speech : a.
Etymology : [Gr. Diedral.]
Definition : Defn: Having two plane faces; as, the dihedral summit of a crystal. Dihedral angle, the angular space contained between planes which intersect. It is measured by the angle made by any two lines at right angles to the two planes.
Source : Webster's Unabridged Dictionary, 1913