VOLCANIC FOCI
\vɒlkˈanɪk fˈə͡ʊsa͡ɪ], \vɒlkˈanɪk fˈəʊsaɪ], \v_ɒ_l_k_ˈa_n_ɪ_k f_ˈəʊ_s_aɪ]\
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Subterraneous centres of igneous action.
By Stormonth, James, Phelp, P. H.
