octadecahedral

adjective1

1. •
   In the form of an octadecahedron.

   • The ¹¹B spectra of B₁₀H₁₀CN(Me)₃ and the salt Na^⊕[B₁₀H₁₀CH]^⊖ were essentially similar and the structure was rationalized in terms of a “clovo” octadecahedral structure of C₂ᵥ symmetry (65). — 1969