poˈtassio-combining form of potassium, in the names of double salts of potassium and another substance, as poˌtassio-ˈplatinum (attrib.), poˌtassio-ˈferricadj., of potassium and iron, poˌtassio-mercuric, potassio-plaˈtinic, potassio-tarˈtaricadjs., poˌtassio-ˈtartrate, etc.1873C. H. Ralfe Phys.Chem. 108 The potassio platinum chloride removed by filtration.1876Harley Mat. Med. (ed. 6) 308 Potassio-platinic chloride,..insoluble in alcohol and æther.1897Allbutt's Syst.Med. IV. 403 A little tartrate of potash, or potassio-tartrate of soda may be given.