placentation

[ plas-uh n-tey-shuh n ]

/ ˌplæs ənˈteɪ ʃən /

noun

Anatomy, Zoology.

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

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

Nearby words

placental lobe, placental membrane, placental presentation, placental souffle, placentate, placentation, placentia, placentia bay, placentitis, placentography, placentoma

Origin of placentation

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for placentation

To Santalaceæ they approach in processes, valvate corolla, and placentation, also to Loranthaceæ.
Journals of Travels in Assam, Burma, Bhootan, Afghanistan and The|William Griffith
The placentation is constantly axile in the inferior row and parietal in the upper one.
Vegetable Teratology|Maxwell T. Masters
In double flowers of Primulaceæ similar alterations in the placentation may often be observed.
Vegetable Teratology|Maxwell T. Masters

British Dictionary definitions for placentation

placentation

/ (ˌplæsɛnˈteɪʃən) /

noun

botany the way in which ovules are attached in the ovary

zoology

the way in which the placenta is attached in the uterus
the process of formation of the placenta

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for placentation

placentation

[ plăs′ən-tā′shən ]

n.

Formation of a placenta in the uterus.

The type or structure of a placenta.