One of the mysteries of the English language finally explained.
Either of two highly symmetrical convex polyhedra with twenty-six faces and identical vertices, formed by the intersection of a cube, octahedron, and rhombic dodecahedron; especially (more fully "small rhombicuboctahedron") the one with eighteen square and eight triangular faces.
Early 20th century; earliest use found in Encyclopaedia Britannica. From rhombic + cubo-octahedron, after post-classical Latin rhombicuboctaëdron (J. Kepler Harmonices mundi ii. 62).
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