PROTOZOAN

\pɹˈə͡ʊtə͡ʊzˌə͡ʊn], \pɹˈə‍ʊtə‍ʊzˌə‍ʊn], \p_ɹ_ˈəʊ_t_əʊ_z_ˌəʊ_n]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1871 - The Cabinet Dictionary of the English Language