OSTIUM, OSTIA
\ˈɒsti͡əm], \ˈɒstiəm], \ˈɒ_s_t_iə_m]\
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Any mouth-like opening ; the openings of the Fallopian tubes ; the opening in the crustacean heart by means of which the blood enters the heart from the pericardium ; the opening from flagellate canal into paragastric cavity in Sponges.
By Henderson, I. F.; Henderson, W. D.
