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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.