dihedral

adjective

1. having or formed by two planes.
2. of or relating to a dihedron.

noun

3. dihedron.
4. Aeronautics. the angle at which the right and left wings or the halves of any other horizontal surface of an airplane or the like are inclined upward or downward.

adjective

1. having or formed by two intersecting planes; two-sideda dihedral angle

noun

2. Also called: dihedron, dihedral angle the figure formed by two intersecting planes
3. the US name for corner (def. 2)
4. the upward inclination of an aircraft wing in relation to the lateral axisCompare anhedral

1. Formed by a pair of planes or sections of planes that intersect.