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

 

dodecahedron

 noun
noun
BrE BrE//ˌdəʊdekəˈhiːdrən//
 
; NAmE NAmE//ˌdoʊdekəˈhiːdrən//
 
; BrE BrE//ˌdəʊdekəˈhedrən//
 
; NAmE NAmE//ˌdoʊdekəˈhedrən//
 
(geometry)
 
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a solid figure with twelve flat sides Word Origin late 16th cent.: from Greek dōdekaedron, neuter (used as a noun) of dōdekaedros ‘twelve-faced’.
See the Oxford Advanced American Dictionary entry: dodecahedron