Home › Words › I › indiumindium/ˈɪndi.əm/indium means A chemical element (symbol In) with an atomic number of 49: a soft silvery-white metal.indium is pronounced /ˈɪndi.əm/.EtymologyCoined as a New Latin term from German Indigo (“indigo”), based on the color of its spectral lines.nounA chemical element (symbol In) with an atomic number of 49: a soft silvery-white metal.A single atom of this element.Definitions & examples from Wiktionary (CC BY-SA 3.0).