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.
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
Thus, in the case of marginal placentation the number must be limited by the narrow space from which they proceed, whereas in parietal and free central placentation the ovules are generally numerous.
From Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants by Masters, Maxwell T.
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
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.
