dihedral
/daɪˈhiːdrəl/
adjective
- Having or relating to two plane faces or surfaces that meet at an angle.
- The dihedral angle of the roof helps rainwater run off easily.
- The crystal has a dihedral shape with two flat sides meeting at a sharp edge.
- A dihedral mirror system can reflect light in two directions.
noun
- The angle between two planes or surfaces, especially in geometry or aviation (the upward angle of an aircraft's wings from the horizontal).
- The wings of the airplane have a slight dihedral to improve stability.
- In geometry class, we calculated the dihedral of a pyramid's faces.
- The model plane's dihedral helped it fly straight without wobbling.