Definitions for "Dihedral"
Having two plane faces; as, the dihedral summit of a crystal.
Of a kite or an aëroplane, having wings that make with one another a dihedral angle, esp. when the angle between the upper sides is less than 180°.
Of wing pairs, inclined at an upward angle to each other.
Keywords:  conducive, flaring, book, open, shaped
A flaring rock structure shaped much like an open book.
see Open book
(n) a flaring structure shaped much like an open book. Often conducive to "stemming" techniques