Pronunciation: /dʌɪˈhiːdr(ə)l/
adjective
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having or contained by two plane faces: a dihedral angle
noun
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1an angle formed by two plane faces.
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2 [mass noun] Aeronautics inclination of an aircraft’s wing from the horizontal, especially upwards away from the fuselage. Compare with anhedral.
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3North American Climbing a place where two planes of rock meet at an angle of between 60° and 120°.
