HYPOSPHENE

\hˌa͡ɪpə͡ʊsfˈiːn], \hˌa‍ɪpə‍ʊsfˈiːn], \h_ˌaɪ_p_əʊ_s_f_ˈiː_n]\
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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