[ 'mα:kəsʌɪt , -zi:t ]
■ noun
1》 a semi-precious stone consisting of iron pyrites.
2》 a bronze-yellow mineral consisting of iron disulphide but differing from pyrite in typically forming aggregates of tabular crystals.
3》 a piece of polished steel or similar metal cut as a gem.
Origin
ME: from med. L. marcasita , from Arab. marḳašīṯa , from Pers.