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dihedral a. 有兩個平面的
n. 兩面角 有兩個平面的兩面角 Dihedral \Di*he"dral\, a. [Gr. di- = di`s- twice ? a seat,
bottom, base, fr. ? to sit. Cf. {Diedral}.] 1. Having two plane faces; as, the dihedral summit of a crystal. [1913 Webster] 2. 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]. [Webster 1913 Suppl.] 3. (A["e]ronautics) Of wing pairs, inclined at an upward angle to each other. [Webster 1913 Suppl.] {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. [1913 Webster]
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