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.
© Webster 1913
Di*he"dral (?), a.
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 angle to each other.
© Webster 1913