Definition
(1) (noun) : an angle between two plane surfaces; the upward slope of an aircraft’s wing (2) (adjective) : consisting of, relating to or contained between two plane surfaces
DFW's Sentence The mattress, a Simmons Beautyrest whose tag said it could not by law be removed, now formed the hypotenuse of a right dihedral triangle whose legs were myself and the bed's box spring.
My Sentence I've read all the literature Sir and I still have no fucking idea what a dihedral triangle is or why I should care cause as I see it triangles work best alone, like, without a modifier complicating things.
01: DFW Source: The Awakening of My Interest in Annular Systems (p.62)
02: Definition Source: Ninjawords and Wikipedia