Pronunciation: [ˈapət] (IPA)
Correct spelling for the English word "Apert" is [ˈapət], [ˈapət], [ˈa_p_ə_t] (IPA phonetic alphabet).
Openly.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
Correct spelling for Apert