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单词 placentation
释义

placentation

[ plas-uhn-tey-shuhn ]
/ ˌplæs ənˈteɪ ʃən /

noun

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

Words nearby placentation

placenta membranacea, placenta previa, placenta reflexa, placenta spuria, placentate, placentation, Placentia, Placentia Bay, placentitis, placentography, placentoma
Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences 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
  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

Medical definitions for placentation

placentation
[ plăs′ən-tā′shən ]

n.

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.
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更新时间：2024/12/23 19:16:37