Dihedral

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Dihedral \Di*he"dral\, a. [Gr. di- = di`s- twice + ? a seat,
     bottom, base, fr. ? to sit. Cf. {Diedral}.]
     1. Having two plane faces; as, the dihedral summit of a
        crystal.
        [1913 Webster]
  


     2. Of a kite or an a["e]roplane, having wings that make with
        one another a dihedral angle, esp. when the angle between
        the upper sides is less than 180[deg].
        [Webster 1913 Suppl.]
  
     3. (A["e]ronautics) Of wing pairs, inclined at an upward
        angle to each other.
        [Webster 1913 Suppl.]
  
     {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.
        [1913 Webster]