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am·ni·o·nit·is | \ ˌam-nē-ə-ˈnī-təs 
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\Medical Definition of amnionitis
: inflammation of the amnion typically due to infection
Organisms that inhabit the cervix, vagina, or rectum can spread upward into the amniotic cavity through intact or ruptured membranes and cause amnionitis. — Richard A. Polan et al., in Avery's Diseases of the Newborn, 2005 also : chorioamnionitis Oligohydramnios is frequently associated with chorioamnionitis (amnionitis), an infection of the membranes that surround the baby … — Sandy Jones and Marcie Jones, Great Expectations: Your All-In-One Resource for Pregnancy & Childbirth, 2004
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