PROMINENTIA SPIRALIS

\pɹˌɒmɪnˈɛnʃə spˈa͡ɪ͡əɹə͡lˌiz], \pɹˌɒmɪnˈɛnʃə spˈa‍ɪ‍əɹə‍lˌiz], \p_ɹ_ˌɒ_m_ɪ_n_ˈɛ_n_ʃ_ə s_p_ˈaɪə_ɹ_əl_ˌi_z]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe