ostium
os·ti·um
noun \ˈäs-tē-əm\ plural os·tia\-tē-ə\
Definition of OSTIUM
: a mouthlike opening in a bodily part (as a fallopian tube or a blood vessel)
Origin of OSTIUM
New Latin, from Latin, door, mouth of a river; akin to Latin os mouth — more at oral
First Known Use: 1828
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