POLYCHASIUM

\pˌɒlɪt͡ʃˈe͡ɪsi͡əm], \pˌɒlɪt‍ʃˈe‍ɪsi‍əm], \p_ˌɒ_l_ɪ_tʃ_ˈeɪ_s_iə_m]\
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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