tri·he·dron / trīˈhēdrən/ • n. (pl. -drons or -dra / -drə/ ) a solid figure having three sides or faces (in addition to the base or ends).
"trihedron." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (January 24, 2019). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/trihedron
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