正八面体(せいはちめんたい)は立体の名称の1つ。空間を正三角形8枚で囲んだ形。
数学関連のスタブ項目 | 正多面体 | デルタ多面体 | Octàedre | Oktaeder | Oktaeder | Octahedron | Octaedro | Octaèdre | Ottaedro | 정팔면체 | Octaëder | Ośmiościan foremny | Octaedro | Oktaeder
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