plaˈtos-, plaˈtoso-Chem.Formative, shortened from platinoso-, forming names of compounds in which platinum is bivalent, as plaˈtosamine, NH2Pt, the ammonia-base supposed by Gerhardt to exist in the ammonio-platinous compounds (Watts); platosaˈmmonium, the group Pt. 2NH3 (as in platosammonium chloride, Pt. 2NH3Cl), platosodiaˈmmonium, the group Pt. 2N2H6 (as in platosodiammonium chloride, Pt. 2N2H6Cl).1856Miller Elem.Chem. II. 1066 Salts of Platosamine (Reiset's second base)..Hydrochlorate of platosamine (yellow) PtH3N.Cl.1857Ibid. III. 260 The two platinum bases from pyridine are:—Platinopyridine..Platosopyridine.1865Mansfield Salts 455 ‘Reiset's second Platinum base’..is supposed by Gerhardt to contain a body which he calls an alkali, ‘Platosamine’, NH2Pt.1873Watts Fownes' Chem. (ed. 11) 349 Platinum dichloride absorbs 2 molecules of ammonia, forming platosammonium chloride.