INTERPAROXYSMAL

\ˌɪntəpˈaɹəksˌɪsmə͡l], \ˌɪntəpˈaɹəksˌɪsmə‍l], \ˌɪ_n_t_ə_p_ˈa_ɹ_ə_k_s_ˌɪ_s_m_əl]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1900 - A dictionary of medicine and the allied sciences
By Alexander Duane