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Random Glossary Entry
Placenta
(plə-sěn'tə) n.
pl.pla·cen·tas or pla·cen·tae (-tē)
A membranous vascular organ that develops in female mammals during
pregnancy, lining the uterine wall and partially enveloping the fetus,
to which it is attached by the umbilical cord. Following birth, the
placenta is expelled.