placentation

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Related to axile placentation: parietal placentation

placentation

 [plas″en-ta´shun]
the series of events following implantation of the embryo and leading to development of the placenta.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

plac·en·ta·tion

(plas'en-tā'shŭn),
The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta. Types of placentation are defined under placenta.
Farlex Partner Medical Dictionary © Farlex 2012

placentation

(plăs′ən-tā′shən)
n.
a. Formation of a placenta in the uterus.
b. The type or structure of a placenta.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

placentation

Obstetrics The formation of the placenta in the uterus; the process by which a placenta grows and develops in the uterus. See Extrachorial placentation.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

plac·en·ta·tion

(plas'en-tā'shŭn)
The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

placentation

the arrangement of PLACENTAS (2) in the plant ovary, which can be classified into several categories including:
  1. (a) apical, at the ovary apex,
  2. (b) basal, at the ovary base,
  3. (c) parietal, on the ovary wall,
  4. (d) free-central, on a column growing up from the ovary base.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The ovary is superior with axile placentation and is 4-6-carpellate; each carpel is subdivided by a partial secondary septum.
Ovary 4-10-locular, with axile placentation and only 1 to few ovules per locule, superior, sometimes with fleshy papillae; style continuous with the ovary; stigma truncate.
Ovary (4-)5-locular, with axile placentation, superior; style impressed; stigma truncate.
Ovary 1-14-locular, with axile placentation, superior; style gradually tapered or impressed; stigma truncate, capitate, peltate, cup shaped, funnel shaped, or strongly lobed, considerably enlarged in wind pollinated species.
Ovary (l-)4(-8)-locular, with axile placentation, superior; style gradually tapered or impressed; stigma truncate, capitate, peltate, cup shaped, funnel shaped, or strongly 4-lobed, considerably enlarged in wind pollinated species.
Cronquist (1981) maintained that, in combination, its unique leaves, imbricate corolla lobes, and bilocular ovary with axile placentation make the Saccifoliaceae incongruous in the Gentianaceae.