dihedral

1. Formed by or having two plane faces; two-sided.
2. Relating to, having, or forming a dihedral angle.

1. Mathematics.
   1. A dihedral angle.
   2. A dihedral group.
2. Aeronautics. The upward or downward inclination of an aircraft wing from true horizontal.

An angle formed by the intersection of two planes (e.g. two faces of a polyhedron). The dihedral angle is the angle formed by taking a point on the line of intersection and drawing two lines from this point, one in each plane, perpendicular to the line of intersection.

Dihedral may refer to:

• Dihedral angle, the angle between two mathematical planes
• Dihedral (aircraft), the upward angle of a fixed-wing aircraft's wings where they meet at the fuselage, dihedral effect of an aircraft, longitudinal dihedral angle of a fixed-wing aircraft
• Dihedral group, the group of symmetries of the n-sided polygon in abstract algebra
  • Also Dihedral symmetry in three dimensions
• Dihedral kite, also known as a bowed kite
• Dihedral doors, also known as butterfly doors
• Dihedral prime, also known as a dihedral calculator prime

See also

• wiktionary:Dihedral
• wiktionary:Polyhedral
  • Polyhedron, a geometric shape
• wiktionary:Anhedral
  • Euhedral, a crystal structure

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