PHOTOGEN

\fˈə͡ʊtə͡ʊd͡ʒən], \fˈə‍ʊtə‍ʊd‍ʒən], \f_ˈəʊ_t_əʊ_dʒ_ə_n]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.