Correct spelling for the English word "Demesnial" is [dɛmˈɛsnɪəl], [dɛmˈɛsnɪəl], [d_ɛ_m_ˈɛ_s_n_ɪ__ə_l] (IPA phonetic alphabet).
Pert. to demesnes.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.