Pronunciation: [ˈɛkstɹəzəɹəs] (IPA)
Correct spelling for the English word "extraserous" is [ˈɛkstɹəzəɹəs], [ˈɛkstɹəzəɹəs], [ˈɛ_k_s_t_ɹ_ə_z_ə_ɹ_ə_s] (IPA phonetic alphabet).
Outside of a serous cavity.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Correct spelling for extraserous