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Meaning of DIHEDRAL

Webster's 1913 Dictionary
  1. \Di*he"dral\, a. [Gr. di- = di`s- twice + ? a seat,
    bottom, base, fr. ? to sit. Cf. {Diedral}.]
    Having two plane faces; as, the dihedral summit of a crystal.
    {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.
  2. \Di*he"dral\, a.
    1. 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].
    2. (A["e]ronautics) Of wing pairs, inclined at an upward
       angle to each other.