DIPHTHEROTOXIN

\dˈɪfθəɹˌə͡ʊtəksˌɪn], \dˈɪfθəɹˌə‍ʊtəksˌɪn], \d_ˈɪ_f_θ_ə_ɹ_ˌəʊ_t_ə_k_s_ˌɪ_n]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe