Origin of heptahedron
"heptahedron." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/heptahedron>.
heptahedron. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/heptahedron
(plural heptahedrons or heptahedra)
hepta- + -hedron
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