DIHEDRAL
- the angle between two planes, also DIEDRAL [n -S]
- having or formed by two planes
- a dihedron (a figure formed by two intersecting planes) [n DIHEDRALS]
- of or pertaining to a dihedron
- figure formed by two intersecting planes
- 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