PROTOMONOSTELIC

\pɹˌə͡ʊtə͡ʊmˌɒnəstˈɛlɪk], \pɹˌə‍ʊtə‍ʊmˌɒnəstˈɛlɪk], \p_ɹ_ˌəʊ_t_əʊ_m_ˌɒ_n_ə_s_t_ˈɛ_l_ɪ_k]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.
 
1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth