Definition of rhombicuboctahedron in US English:

rhombicuboctahedron

(also rhombi-cubo-octahedron, rhombicubeoctahedron)

noun

Geometry
  • 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.

Origin

Early 20th century; earliest use found in Encyclopaedia Britannica. From rhombic + cubo-octahedron, after post-classical Latin rhombicuboctaëdron (J. Kepler Harmonices mundi ii. 62).

Pronunciation

rhombicuboctahedron

/ˌrɒmbɪˌkjuːbɒktəˈhiːdrən/