Correct spelling for the English word "Peripherical" is [pəɹɪfˈɛɹɪkə͡l], [pəɹɪfˈɛɹɪkəl], [p_ə_ɹ_ɪ_f_ˈɛ_ɹ_ɪ_k_əl] (IPA phonetic alphabet).
Pert. to a periphery, or constituting one; in bot., peripherical is applied to an embryo curved so as to surround the albumen, following the inner part of the covering of the seed.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.