SPERMATOCYST

\spˈɜːmɐtˌɒsɪst], \spˈɜːmɐtˌɒsɪst], \s_p_ˈɜː_m_ɐ_t_ˌɒ_s_ɪ_s_t]\
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1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth