In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.
It is a 3-dimensional cross polytope (shape).
---Wikipedia
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An octahedron has eight faces. If it has 62 faces then it is not an octahedron!
An octahedron has eight bases/faces.
An octahedron has 8 sides.
8 of them
A "dodeca" is a prefix: it is not a shape. An octahedron has eight faces.