PROCHROMATIN

\pɹˈɒkɹə͡ʊmˌatɪn], \pɹˈɒkɹə‍ʊmˌatɪn], \p_ɹ_ˈɒ_k_ɹ_əʊ_m_ˌa_t_ɪ_n]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
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