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placenta  n pl , -tas, -tae 
1 the vascular organ formed in the uterus during pregnancy, consisting of both maternal and embryonic tissues and providing oxygen and nutrients for the fetus and transfer of waste products from the fetal to the maternal blood circulation 
See also  →  afterbirth 
2 the corresponding organ or part in certain mammals 
3  (Botany) 
a the part of the ovary of flowering plants to which the ovules are attached 
b the mass of tissue in nonflowering plants that bears the sporangia or spores 
 (C17: via Latin from Greek plakoeis flat cake, from plax flat)