oxythiomolybdate UK /ɒksiθaɪəʊˈmɒlɪbdeɪt/US /ɑksiθaɪoʊˈmɑlɪbdeɪt/ noun1 •An anion containing molybdenum, sulfur, and oxygen, specifically MoOS₃⁻². formsoxythiomolybdates