Adjective : a trihedral angle. From Dictionary.com.
The angle between two planes is termed dihedral, between three trihedral, between any number more than three polyhedral. From Wordnik.com. [Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1] Reference
There were triple suns that revolved slowly about one another -- stange as it may seem -- in perfect trihedral symmetry. From Wordnik.com. ["He Who Shrank" by Henry Hasse, part 4] Reference
Those about the lamina spiralis are certainly necessary -- illus. substitution of trihedral for triangular. From Wordnik.com. [Life and Letters of Thomas Henry Huxley — Volume 2] Reference
If we pass a plane cutting all the edges of a trihedral angle of the poly - hedron (i.e., a cube here), we separate one of the vertices from the rest of the polyhedron. From Wordnik.com. [Recently Uploaded Slideshows] Reference
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