having or formed by two planes.
of or pertaining to a dihedron.
Aeronautics. the angle at which the right and left wings or the halves of any other horizontal surface of an airplane or the like are inclined upward or downward.

1790–1800; di-1 + -hedral

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World English Dictionary
dihedral (daɪˈhiːdrəl)
1.  having or formed by two intersecting planes; two-sided: a dihedral angle
2.  dihedron, Also called: dihedral angle the figure formed by two intersecting planes
3.  the US name for corner
4.  Compare anhedral the upward inclination of an aircraft wing in relation to the lateral axis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
dihedral   (dī-hē'drəl)  Pronunciation Key 
Formed by a pair of planes or sections of planes that intersect.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Added dihedral or sweep again may be used to decrease these detrimental effects.
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