† merˈcuriateChem.Obs. [f. Mercury + -ate1.] A salt of the supposed mercuric acid. 1801Encycl.Brit. (ed. 3) Suppl. I. 388/2 Mercuriat of lime... Mercuriat of ammonia.1802T. Thomson Chem. I. 433 This compound may be called mercuriat [ed. 3, 1807, mercuriate] of lime.