Correct spelling for the English word "soamine" is [sˈə͡ʊma͡ɪn], [sˈəʊmaɪn], [s_ˈəʊ_m_aɪ_n] (IPA phonetic alphabet).
Sodium para-aminophenylarsonate, an arylarsonate employed in the treatment of syphilis, in doses of gr. 10 (0.6) by hypodermic injection every other day.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.