DIRECTIVE SPHERE

\da͡ɪɹˈɛktɪv sfˈi͡ə], \da‍ɪɹˈɛktɪv sfˈi‍ə], \d_aɪ_ɹ_ˈɛ_k_t_ɪ_v s_f_ˈiə]\
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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.