Definition of placenta
plural placentas
or placentae
play
\plə-ˈsen-(ˌ)tē\
1
:the vascular organ in mammals except monotremes and marsupials that unites the fetus to the maternal uterus and mediates its metabolic exchanges through a more or less intimate association of uterine mucosal with chorionic and usually allantoic tissues;
also
:an analogous organ in another animal
2
:a sporangium-bearing surface;
especially
:the part of the carpel bearing ovules
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