Pronunciation: (dī-hē'drul), [key]
1. having or formed by two planes.
2. of or pertaining to a dihedron.
2. Aeron.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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.