Definition of placenta noun from the Oxford Advanced Learner's Dictionary

 

placenta

 noun
noun
BrE BrE//pləˈsentə//
 
; NAmE NAmE//pləˈsentə//
 
(also the placenta)(anatomy) Pregnancy
 
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the material that comes out of a woman or female animal’s body after a baby has been born, and which was necessary to feed and protect the baby synonym afterbirth See related entries: Pregnancy Word Origin late 17th cent.: from Latin, from Greek plakous, plakount- ‘flat cake’, based on plax, plak- ‘flat plate’.
See the Oxford Advanced American Dictionary entry: placenta