In geometry, the tridiminished rhombicosidodecahedron is one of the Johnson solids (). It can be constructed as a rhombicosidodecahedron with three pentagonal cupolae removed.
Related Johnson solids are: : diminished rhombicosidodecahedron with one cupola removed, : parabidiminished rhombicosidodecahedron with two opposing cupolae removed, : metabidiminished rhombicosidodecahedron with two non-opposing cupolae removed, and : gyrate bidiminished rhombicosidodecahedron with two non-opposing cupolae removed and one cupola rotated 36 degrees.
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