1. 
   Dihedral
   Di·he'dral adjective [ Greek di- = di`s- twice + ... a seat, bottom, base, from ... to sit. Confer Diedral .] Having two plane faces; as, the dihedral summit of a crystal. Dihedral angle , the angular sp...
   Found op http://www.encyclo.co.uk/webster/D/65
   
   
2. 
   Dihedral
   Di·he'dral adjective 1. Of a kite or an aëroplane, having wings that make with one another a dihedral angle, esp. when the angle between the upper sides is less than 180°. 2. (Aëronautics) Of wing pairs, inclined at an upward a...
   Found op http://www.encyclo.co.uk/webster/D/65
   
   
3. 
   Dihedral
   • (a.) Having two plane faces; as, the dihedral summit of a crystal. • (a.) Of wing pairs, inclined at an upward angle to each other. • (a.) 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 18...
   Found op http://thinkexist.com/dictionary/meaning/dihedral/
   
   
4. 
   Dihedral
   [aircraft] Dihedral angle is the upward angle from horizontal of the wings or tailplane of a fixed-wing aircraft. Anhedral angle is the name given to negative dihedral angle, that is, when there is a downward angle from horizontal of the wings or tailplane of a fixed-wing aircraft. Dihedral ...
   Found op http://en.wikipedia.org/wiki/Dihedral_(aircraft)
   
   
5. 
   DIHEDRAL
   The acute angle, usually upward, between the wing of an airplane and a horizontal cross-section line. Opposite of ANHEDRAL.
   Found op http://www.aerofiles.com/glossary.html
   
   

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