combining form of the word ammoniumn., indicating the presence of that basyl or its salts in a compound; thus ammonio-chloride of silver, ammonio-cupric sulphate, ammonio-magnesian phosphate = magnesium and ammonium phosphate.
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1853 Family Her. 3 Dec. 510/2 The solution of ammonio-nitrate of silver.
1876 J. HarleyRoyle's Man. Materia Med. (ed. 6) 207 Ammonio-chloride of Iron was discovered by Basil Valentine in the 14th cent.