[ plas-uh n-tey-shuh n ]
/ ˌplæs ənˈteɪ ʃən /


Anatomy, Zoology.
  1. the formation of a placenta.
  2. the manner of placement or construction of a placenta.
Botany. the disposition or arrangement of a placenta or placentas.

Origin of placentation

From French, dating back to 1750–60; see origin at placenta, -ation Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for placentation

British Dictionary definitions for placentation


/ (ˌplæsɛnˈteɪʃən) /


botany the way in which ovules are attached in the ovary
  1. the way in which the placenta is attached in the uterus
  2. 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


[ plăs′ən-tāshən ]


Formation of a placenta in the uterus.
The type or structure of a placenta.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.