noun
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botany the way in which ovules are attached in the ovary
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zoology
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the way in which the placenta is attached in the uterus
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the process of formation of the placenta
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Etymology
Origin of placentation
From French, dating back to 1750–60; see origin at placenta, -ation
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
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
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
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
There is only one of these that need be specially mentioned—the important fact, established by Selenka in 1890, that the distinctive human placentation is confined to the anthropoids.
From The Evolution of Man — Volume 1 by Haeckel, Ernst Heinrich Philipp August
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
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
