ironstone C2 Topic:Materials & Substances US /ˈaɪ.ɚnˌstoʊn/ UK /ˈaɪ.ən.stəʊn/ See IPA manual Freq #190478 Meanings 1 noun an iron-rich sedimentary rock or ore The exposed band of ironstone stained the soil reddish brown. Thesaurus Synonyms 1 noun · an iron-rich sedimentary... iron ore Etymology From iron + stone. Topics Materials & Substances External links Cambridge Dictionary Wiktionary Google Images # ironstone **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /ˈaɪ.ɚnˌstoʊn/ **IPA (UK):** /ˈaɪ.ən.stəʊn/ **Frequency rank:** 190478 ## Meanings 1. an iron-rich sedimentary rock or ore ## Examples - The exposed band of ironstone stained the soil reddish brown. ## Synonyms - iron ore ## Etymology From iron + stone. ## Topics - Materials & Substances markdown