molybdatePronunciation: /məˈlɪbdeɪt/Definition of molybdate noun Chemistry a salt in which the anion contains both molybdenum and oxygen, especially one of the anion MoO42−. Origin: late 18th century: from molybdic (acid), a parent acid of molybdates, + -ate1molybdate in other Oxford dictionaries Definition of molybdate in the US English dictionary