Correct spelling for the English word "bismon" is [bˈɪsmən], [bˈɪsmən], [b_ˈɪ_s_m_ə_n] (IPA phonetic alphabet).
Colloidal bismuth oxide, employed like bismuth subnitrate in doses of gr. 8 (0.5) in milk.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.