Correct spelling for the English word "asferryl" is [ɐsfˈɜːɹɪl], [ɐsfˈɜːɹɪl], [ɐ_s_f_ˈɜː_ɹ_ɪ_l] (IPA phonetic alphabet).
Trade name of a preparation, said to contain 23 per cent. Arsenic and 18 per cent, iron; a greenish-yellow powder slightly soluble in water, employed in doses of gr. 1/3-2/3 (0.02-0.04) twice daily.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.