-oan

Suffixal construction from -o(us) +‎ -an.

-oan

1. Used to convert the name of an atom or ion to an adjective that means containing cations or anions of that atom or ion.

   ‎bismuth + ‎-oan → ‎bismuthoan (“containing trivalent bismuth”)

   ‎cupro- (“copper”) + ‎-oan → ‎cuproan (“containing monovalent copper”)

   ‎plumbo- (“lead”) + ‎-oan → ‎plumboan (“containing divalent lead”)