单词	placentation
释义	placentation noun pla·​cen·​ta·​tion ˌpla-sᵊn-ˈtā-shən  plə-ˌsen- 1 : the arrangement of placentas and ovules in a plant ovary 2 a : the development of the placenta and attachment of the fetus to the uterus during pregnancy b : the morphological type of a placenta Example Sentences Recent Examples on the Web Another possible cause for higher hormone levels leading to excessive nausea is something called abnormal placentation, where the placenta overgrows, says Liu, adding that this happens only occasionally. Miriam Falco And Alanne Orjoux, CNN, 4 Sep. 2017 Word History First Known Use 1760, in the meaning defined at sense 1 Medical Definition placentation noun pla·​cen·​ta·​tion ˌplas-ᵊn-ˈtā-shən, plə-ˌsen-  1 : the development of the placenta and attachment of the fetus to the uterus during pregnancy 2 : the morphological type of a placenta
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