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



BrE BrE//ˌpentəˈhiːdrən//
; NAmE NAmE//ˌpentəˈhiːdrən//
; BrE BrE//ˌpentəˈhedrən//
; NAmE NAmE//ˌpentəˈhedrən//
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a solid shape with five flat sides Word Origin late 18th cent.: from penta- ‘five’ + -hedron, on the pattern of words such as polyhedron.
See the Oxford Advanced American Dictionary entry: pentahedron