PROOSTRACUM
\pɹˈuːstɹakəm], \pɹˈuːstɹakəm], \p_ɹ_ˈuː_s_t_ɹ_a_k_ə_m]\
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The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.
By Oddity Software
By Henderson, I. F.; Henderson, W. D.
By J.H. Kenneth