MONTHLY PERIOD

\mˈʌnθli pˈi͡əɹɪəd], \mˈʌnθli pˈi‍əɹɪəd], \m_ˈʌ_n_θ_l_i p_ˈiə_ɹ_ɪ__ə_d]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland