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

 

octahedron

 noun
noun
BrE BrE//ˌɒktəˈhiːdrən//
 
; NAmE NAmE//ˌɑːktəˈhiːdrən//
 
; BrE BrE//ˌɒktəˈhedrən//
 
; NAmE NAmE//ˌɑːktəˈhedrən//
 
(geometry)
 
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a solid figure with eight flat sides, especially one whose sides are eight equal triangles Word Origin late 16th cent.: from Greek oktaedron, neuter (used as a noun) of oktaedros ‘eight-faced’.
See the Oxford Advanced American Dictionary entry: octahedron