酸さん化か鉄てつさんかてつじ字FuriganaMeanings1nouniron oxideChemical term for compounds of iron and oxygen, such as rust (Fe₂O₃) or magnetite (Fe₃O₄).鉄てつが錆さびると、表ひょう面めんに酸さん化か鉄てつができる。