† platosodiammoniumn.Obsolete a hypothetical ion consisting of a diamide of divalent platinum, now known to be an ammine group (in which there are two ammonia ligands) occurring in platinum compounds.
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1866–77 H. WattsDict. Chem. IV. 678 Chloride of Platosodiammonium.
1868 H. WattsFownes's Man. Elem. Chem. (ed. 10) 354 These tetrammonio-platinous compounds may also be regarded as salts of diammoplatosodiammonium.]