dihedral

dihedral
[dʌɪˈhiːdr(ə)l]
adjective
  1. having or contained by two plane faces
    二面的
    a dihedral angle.
    二面角。
noun
  1. an angle formed by two plane faces
    二面角
    ■[mass noun](Aeronautics)inclination of an aircraft's wing from the horizontal, especially upwards away from the fuselage
    (航天)(机翼)反角。 比较 anhedral
    ■(Climbing N. Amer.)a place where two planes of rock meet at an angle of between 60° and 120°
    (登山 北美)向内的转角,V型裂隙(指岩石的两个面相交成60° 到120°角的地方)
语源
  1. late 18th cent.: from di- 'two' + -hedral (see -hedron)
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