noun Download 🔗Share A chemical element (symbol Ir) with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group. Examples : "Because of its extreme hardness and resistance to corrosion, iridium is used in specialized electrical contacts and scientific instruments. " element chemistry material substance science Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A single atom of this element. Examples : "The scientist carefully isolated a single iridium atom for study under the microscope. " element chemistry material substance science Chat with AIVocabulary GamePractice Reading