/ Dictionary / Index D dihedral: Meaning and Definition of Find definitions for: di•he•dral Pronunciation: (dī-hē'drul), [key] — adj. having or formed by two planes. of or pertaining to a dihedron. —n. dihedron. 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. digressive dihedral angle Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language