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a. Formation of a placenta in the uterus.
b. The type or structure of a placenta.
2. Botany Arrangement of placentas within the ovary.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Botany) botany the way in which ovules are attached in the ovary
2. (Zoology) zoology
a. the way in which the placenta is attached in the uterus
b. the process of formation of the placenta
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||placentation - the formation of the placenta in the uterus|
|2.||placentation - arrangement of the ovules in the placenta and of the placentas in the ovary|
reproductive structure - the parts of a plant involved in its reproduction
apical placentation - where one or few ovules develop at the top of a simple or compound ovary
axile placentation - ovules are borne at or around the center of a compound ovary on an axis formed from joined septa
basal placentation - where one or few ovules develop at the base of a simple or compound ovary
free central placentation - where ovules develop on a central column in a compound ovary lacking septa or with septa at base only
lamellate placentation - with ovules on thin extensions of the placentae into a compound ovary
marginal placentation, ventral placentation - with ovules borne on the wall along the ventral suture of a simple ovary
parietal placentation - where ovules develop on the wall or slight outgrowths of the wall forming broken partitions within a compound ovary
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