Correct spelling for the English word "rapil" is [ɹˈapə͡l], [ɹˈapəl], [ɹ_ˈa_p_əl] (IPA phonetic alphabet).
Pulverised volcanic substances.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.