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



BrE BrE//ˌdekəˈhiːdrən//
, also BrE//ˌdekəˈhedrən//
; NAmE NAmE//ˌdekəˈhiːdrən//
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a solid shape with ten straight sides and ten angles Word Origin early 19th cent.: from deca- ‘ten’ + -hedron, on the pattern of words such as polyhedron.
See the Oxford Advanced American Dictionary entry: decahedron