Definition of heptahedron noun from the Oxford Advanced Learner's Dictionary

 

heptahedron

 noun
noun
BrE BrE//ˌheptəˈhiːdrən//
 
; NAmE NAmE//ˌheptəˈhiːdrən//
 
; BrE BrE//ˌheptəˈhedrən//
 
; NAmE NAmE//ˌheptəˈhedrən//
 
(geometry)
 
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a solid figure with seven flat sides Word Origin late 17th cent.: from hepta- ‘seven’ + -hedron, on the pattern of words such as polyhedron.
See the Oxford Advanced American Dictionary entry: heptahedron