The Collaborative International Dictionary
Trihedron
Trihedron \Tri*he"dron\, n. [Pref. tri- + Gr. ? a seat, base.] (Geom.) A figure having three sides.
Wiktionary
trihedron
n. (context mathematics English) A geometric figure composed of three planes meeting at a single vertex.
Usage examples of "trihedron".
The three noble truths that have just lit up your eyes must therefore be considered as the generating trihedron of a pyramid of wisdom which, unprecedented marvel, will fly light-winged over the weathered oceans of doubt.