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

 

hexahedron

 noun
noun
BrE BrE//ˌheksəˈhiːdrən//
 
; NAmE NAmE//ˌheksəˈhiːdrən//
 
; BrE BrE//ˌheksəˈhedrən//
 
; NAmE NAmE//ˌheksəˈhedrən//
 
(geometry)
 
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a solid shape with six flat sides Word Origin late 16th cent.: from Greek hexaedron, neuter (used as a noun) of hexaedros ‘six-faced’.
See the Oxford Advanced American Dictionary entry: hexahedron