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placentation

[plas-uh n-tey-shuh n]
noun
  1. Anatomy, Zoology.
    1. the formation of a placenta.
    2. the manner of placement or construction of a placenta.
  2. Botany. the disposition or arrangement of a placenta or placentas.
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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. 2018

Examples from the Web for placentation

Historical Examples

  • In double flowers of Primulaceæ similar alterations in the placentation may often be observed.

    Vegetable Teratology

    Maxwell T. Masters

  • The placentation is constantly axile in the inferior row and parietal in the upper one.

    Vegetable Teratology

    Maxwell T. Masters

  • To Santalaceæ they approach in processes, valvate corolla, and placentation, also to Loranthaceæ.


British Dictionary definitions for placentation

placentation

noun
  1. botany the way in which ovules are attached in the ovary
  2. zoology
    1. the way in which the placenta is attached in the uterus
    2. the process of formation of the placenta
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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

placentation in Medicine

placentation

(plăs′ən-tāshən)
n.
  1. Formation of a placenta in the uterus.
  2. The type or structure of a placenta.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.