placentation

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noun

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.

“Parietal placentation occurs in the Brassicaceae family.”

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Meanings

nounplacentation (countable and uncountable, plural placentations)

plural placentations

  1. countableuncountablebiologyThe 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.

    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.

    2004, “Placentation in species of phylogenetic importance: the Afrotheria”, in Animal Reproduction Science
  2. countableuncountablebiologyThe manner in which the seeds are attached to the placenta within the ovary locules.

    Parietal placentation occurs in the Brassicaceae family.

Origin

From placenta + -ation.

Full word history & related roots →
Cite this entry
APA

placentation. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/placentation

MLA

“placentation.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/placentation. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “placentation,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/placentation.

Source: placentation on Wiktionary, CC BY-SA 4.0.