PLACENTATION

placentation. Placentation, n. the disposition of the cotyledons in seeds when they begin to grow

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