SEPTUM ATRIORUM

\sˈɛptəm ˈatɹi͡əɹəm], \sˈɛptəm ˈatɹi‍əɹəm], \s_ˈɛ_p_t_ə_m ˈa_t_ɹ_iə_ɹ_ə_m]\
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1846 - Medical lexicon: a dictionary of medical science
By Robley Dunglison
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland