Correct spelling for the English word "oleflant" is [ˈə͡ʊlflənt], [ˈəʊlflənt], [ˈəʊ_l_f_l_ə_n_t] (IPA phonetic alphabet).
Applied to a gas obtained by heating a mixture of two measures of sulphuric acid and one of alchohol-so called from its forming an oily liquid when mixed with chlorine.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.