sodio-
1 
(in organic chemistry) a combining form representing sodium, in compound words:
sodio-cupric chloride.
1868 Watts Dict. Chem. s.v. Sodium,Sodium occurs as sodio-aluminic fluoride in cryolite. 
1868 Fownes' Chem. (ed. 10) 421A sodio-aurous hyposulphite..is prepared by mixing the concentrated solutions of auric chloride and sodium hyposulphite. 
Ibid. 347A sodiohydric pyrophosphate has been obtained. 
1876 Harley Royle's Mat.Med. 308Sodio-platinic chloride..is soluble in water. 
1898 Allbutt's Syst. Med. V. 991Theobromine, in the form of the sodio-salicylate (diuretin), may be substituted for caffein. 
sodio-
combining form 
Etymology: New Latin sodium 
1. : sodium and 
< sodioaluminic >
< sodiohydric >
2. : containing sodium in place of hydrogen  — used in names of organic compounds
< sodiomalonic ester >
< sodionitromethane >
1.
< sodioaluminic >
< sodiohydric >
2.
< sodiomalonic ester >
< sodionitromethane >
sodio-
Prefix
- obsolete, chemistry compound of sodium