Correct spelling for the English word "phlegmasiae" is [flɛɡmˈe͡ɪsɪˌiː], [flɛɡmˈeɪsɪˌiː], [f_l_ɛ_ɡ_m_ˈeɪ_s_ɪ__ˌiː] (IPA phonetic alphabet).
Any inflammatory disease with fever.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.