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

placenta

noun
 
/pləˈsentə/
 
/pləˈsentə/
(usually the placenta)
(anatomy)
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  1. an organ inside the uterus of a pregnant woman or animal to which the baby is attached and that is necessary to feed and protect the baby compare afterbirthTopics Life stagesc2
    Word Originlate 17th cent.: from Latin, from Greek plakous, plakount- ‘flat cake’, based on plax, plak- ‘flat plate’.
See placenta in the Oxford Advanced American Dictionary
aspiration
noun
 
 
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