INTRAPERITONEAL

\ˈɪntɹəpəɹˌɪtə͡ʊnə͡l], \ˈɪntɹəpəɹˌɪtə‍ʊnə‍l], \ˈɪ_n_t_ɹ_ə_p_ə_ɹ_ˌɪ_t_əʊ_n_əl]\
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1900 - A dictionary of medicine and the allied sciences
By Alexander Duane
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland