Dihedral
Dihedral , adjective
[Greek di- = di`s- twice + {not transcribed} a seat, bottom, base, from {not transcribed} to sit. Compare Diedral.]
1.
Having two plane faces; as, the dihedral summit of a crystal.
2.
Of a kite or an aeroplane, having wings that make with one another a dihedral angle, esp. when the angle between the upper sides is less than 180°.
3.
(Aeronautics) Of wing pairs, inclined at an upward angle to each other.
Collocations (1)
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.