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

octahedron

noun
octahedron pronunciation English ˌɒktəˈhiːdrən octahedron pronunciation American ˌɑːktəˈhiːdrən
octahedron pronunciation English ˌɒktəˈhedrən octahedron pronunciation American ˌɑːktəˈhedrən
(geometry)
 
a solid figure with eight flat sides, especially one whose sides are eight equal triangles