Correct spelling for the English word "Septical" is [sˈɛptɪkə͡l], [sˈɛptɪkəl], [s_ˈɛ_p_t_ɪ_k_əl] (IPA phonetic alphabet).
Having the power to promote putrefaction.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.