ENDOSPORIUM

\ˌɛndə͡ʊspˈɔːɹi͡əm], \ˌɛndə‍ʊspˈɔːɹi‍əm], \ˌɛ_n_d_əʊ_s_p_ˈɔː_ɹ_iə_m]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe