Home › Words › M › manganosideritemanganosideritemanganosiderite · noun — A siderite with significant manganese substituting for iron.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom mangano- + siderite.nounA siderite with significant manganese substituting for iron.Definitions & examples from Wiktionary (CC BY-SA 3.0).