pla·cen·ta·tion /ˌplæsṇˈteʃən, pləˌsɛn-/
  胎盤形成; 胎座式
  pla·cen·ta·tion /ˌplæsṇˈteʃən, pləˌsɛn-/ 名詞
  胎盤形成
  Plac·en·ta·tion n.
  1. Anat. The mode of formation of the placenta in different animals; as, the placentation of mammals.
  2. Bot. The mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation.
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  placentation
       n 1: the formation of the placenta in the uterus
       2: arrangement of the ovules in the placenta and of the
          placentas in the ovary