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. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Stannoso- \Stan*no"so-\ (st[a^]n*n[=o]"s[-o]-), a. (Chem.) A combining form (also used adjectively) denoting relation to, or connection with, certain stannnous compounds.

Source: Webster's Revised Unabridged Dictionary (1913)