Noun
- plural form of heptahedron
heptahedra
English Wiktionary. Available under CC-BY-SA license.
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"heptahedra." YourDictionary, n.d. Web. 22 January 2019. <https://www.yourdictionary.com/heptahedra>.
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heptahedra. (n.d.). Retrieved January 22nd, 2019, from https://www.yourdictionary.com/heptahedra
