Definition and background:
A polyhedron with eight triangular faces. The sides of a right octahedron are identical isosceles triangles. The regular octahedron is one of the five Platonic solids (along with the tetrahedron, hexahedron (cube), dodecahedron, and icosahedron). Also see polygon and vertex.
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Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary