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



BrE BrE//ˌtetrəˈhiːdrən//
; NAmE NAmE//ˌtetrəˈhiːdrən//
; BrE BrE//ˌtetrəˈhedrən//
; NAmE NAmE//ˌtetrəˈhedrən//
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a solid shape with four flat sides that are triangles Word Origin late 16th cent.: from late Greek tetraedron, neuter (used as a noun) of tetraedros ‘four-sided’.
See the Oxford Advanced American Dictionary entry: tetrahedron