placentation

American  

[plas-uhn-tey-shuhn] / ˌplæs ənˈteɪ ʃən /

noun

1. Anatomy, Zoology.

   1. the formation of a placenta.

   2. the manner of placement or construction of a placenta.

2. Botany. the disposition or arrangement of a placenta or placentas.

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placentation British  

/ ˌplæsɛnˈteɪʃən /

noun

1. botany the way in which ovules are attached in the ovary

2. zoology

   1. the way in which the placenta is attached in the uterus

   2. the process of formation of the placenta

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Etymology

Origin of placentation

From French, dating back to 1750–60; placenta, -ation

Example Sentences

The placenta develops throughout the embryonic period and during the first several weeks of the fetal period; placentation is complete by weeks 14–16.

From Textbooks • Jun. 19, 2013

Progesterone secreted by the corpus luteum stimulates the production of decidual cells of the endometrium that nourish the blastocyst before placentation.

From Textbooks • Jun. 19, 2013

An artificial womb has been created for a relative of the grey nurse shark, but sharks’ placentation and how they grow in the womb is a bit less complicated than in humans.

From Salon • Sep. 19, 2012

Hubrecht and E. Selenka on the early development and placentation of the Primates, of J. Graham Kerr and of J.S.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" by Various

In the flowers of Saponaria officinalis Dr. Masters has observed instances of both marginal and free central placentation.

From The Origin of Species by means of Natural Selection, 6th Edition by Darwin, Charles