The Collaborative International Dictionary
Stannoso-
Stannoso- \Stan*no"so-\ (st[a^]n*n[=o]"s[-o]-), a. (Chem.) A combining form (also used adjectively) denoting relation to stannous compounds, or connection with stannous compounds.
Wiktionary
stannoso-
pre. (context chemistry English) Denoting relation to, or connection with, certain stannnous compounds.