Correct spelling for the English word "malignin" is [məlˈɪɡnɪn], [məlˈɪɡnɪn], [m_ə_l_ˈɪ_ɡ_n_ɪ_n] (IPA phonetic alphabet).
A supposed intracellular ferment which endows cancer cells with their malignant character, having the property of digesting normal tissues in an acid medium.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.