MANGANESE DIOXID

\mˈaŋɡənˌiːz da͡ɪˈɒksɪd], \mˈaŋɡənˌiːz da‍ɪˈɒksɪd], \m_ˈa_ŋ_ɡ_ə_n_ˌiː_z d_aɪ_ˈɒ_k_s_ɪ_d]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe