dihedral

Noun

 * 1)  An angle between two plane surfaces
 * 2)  The upward slope of an aircraft's wing
 * 3)  The angle between pairs of chemical bonds separated by a third bond

Adjective

 * 1)  Consisting of, relating to or contained between two plane surfaces.
 * 2)  Having wings that form a dihedral angle, especially when the angle between the upper sides is less than 180&deg;.
 * 3)  Of wing pairs, inclined at an upward angle to each other.
 * 1)  Of wing pairs, inclined at an upward angle to each other.