PERFORATED SPACE

\pˈɜːfəɹˌe͡ɪtɪd spˈe͡ɪs], \pˈɜːfəɹˌe‍ɪtɪd spˈe‍ɪs], \p_ˈɜː_f_ə_ɹ_ˌeɪ_t_ɪ_d s_p_ˈeɪ_s]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe