Origin of heptahedron
"heptahedron." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/heptahedron>.
heptahedron. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/heptahedron
(plural heptahedrons or heptahedra)
hepta- + -hedron
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