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Entry 2 senses Webster, 1913

Placentation

· Plac·en·ta·tion · IPA
01 n. The mode of formation of the placenta in different animals; as, the placentation of mammals.
  1. 1.
    The mode of formation of the placenta in different animals; as, the placentation of mammals.(Anat.)
  2. 2.
    The mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation.(Bot.)