Ostium Definition
ŏstē-əm
ostia
noun
An opening or orifice.
Webster's New World
Any of the small openings or pores in a sponge, through which water is drawn in.
American Heritage
Origin of Ostium
-
Latin ōstium door, opening from ōs mouth ōs- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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