Heptahedron Definition
 hĕptə-hēdrən 
  heptahedra, heptahedrons
  
    noun
  
 A solid figure with seven plane surfaces.
 Webster's New World 
Other Word Forms of Heptahedron
Noun
Singular:
 heptahedronPlural:
 heptahedra, heptahedronsOrigin of Heptahedron
hepta- + -hedron
From Wiktionary
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