ostium

noun
os·ti·um | \ ˈä-stē-əm \
plural ostia\ˈä-stē-ə \

Definition of ostium 

: a mouthlike opening in a bodily part (such as a fallopian tube or a blood vessel)

First Known Use of ostium

1683, in the meaning defined above

History and Etymology for ostium

New Latin, from Latin, door, mouth of a river; akin to Latin os mouth — more at oral

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Dictionary Entries near ostium

ostiolar

ostiolate

ostiole

ostium

ostler

ostleress

ostmark

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The first known use of ostium was in 1683

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More Definitions for ostium

ostium

noun
os·ti·um | \ ˈäs-tē-əm \
plural ostia\-tē-ə \

Medical Definition of ostium 

: a mouthlike opening in a bodily part (as a fallopian tube or a blood vessel) stenosis of coronary ostia —R. L. Cecil & R. F. Loeb

More from Merriam-Webster on ostium

Britannica.com: Encyclopedia article about ostium

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