Correct spelling for the English word "aortarctia" is [e͡ɪˈɔːtɑːkʃə], [eɪˈɔːtɑːkʃə], [eɪ_ˈɔː_t_ɑː_k_ʃ_ə] (IPA phonetic alphabet).
Congenital narrowing of the aorta, aortostenosis; written also aortartia.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.