a soft grey mineral consisting of molybdenum sulphide in hexagonal crystalline form with rhenium as an impurity: the main source of molybdenum and rhenium. Formula: MoS2
molybdenite in American English
(məˈlɪbdəˌnaɪt)
noun
a very soft, lead-gray mineral, MoS2, the chief ore of molybdenum; molybdenum sulfide