placentation

placenta +‎ -ation

placentation (countable and uncountable, plural placentations)

1. (biology) The local fusion of the embryonic stage of an animal to its parent for physiological exchange to promote the growth and development of the young; involves a placenta in non-egglaying mammals.
   • 2004, “Placentation in species of phylogenetic importance: the Afrotheria”, in Animal Reproduction Science:

     Specialized hemophagous regions are a striking characteristic of some of these placentas yet absent in hyraxes, elephant shrews, and golden moles. It is possible that the common ancestor of the Afrotheria had an endotheliochorial placenta.

2. (botany) The manner in which the seeds are attached to the placenta within the ovary locules.

   Parietal placentation occurs in the Brassicaceae family.

   Hyponyms: parietal placentation, axile placentation, free central placentation

• Audio

  (file)

placentation f (plural placentations)

1. placentation

• “placentation”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.