• WordNet 3.6
    • n placentation arrangement of the ovules in the placenta and of the placentas in the ovary
    • n placentation the formation of the placenta in the uterus
    • ***
Webster's Revised Unabridged Dictionary
    • Placentation (Bot) The mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation.
    • Placentation (Anat) The mode of formation of the placenta in different animals; as, the placentation of mammals.
    • ***
Century Dictionary and Cyclopedia
    • n placentation In zoology: The attachment of the embryo or fetus to the uterus by means of a placenta; uterogestation.
    • n placentation The mode in which this attachment is effected; the manner of the disposition or construction of the placenta: as, deciduate or discoidal Placentation.
    • n placentation In botany, the disposition or arrangement of the placentas.
    • ***
Chambers's Twentieth Century Dictionary
    • ns Placentation the mode in which the placenta is formed and attached to the womb
    • ***


Chambers's Twentieth Century Dictionary
L., a flat cake, akin to Gr. plakous, a flat cake, from plax, plak-os, anything flat.


In literature:

Arsenic is a powerful abortive agent in the guinea-pig, probably on account of placental hemorrhages.
"Anomalies and Curiosities of Medicine" by George M. Gould
Omnia enim nostra, supra modum placent.
"The Anatomy of Melancholy" by Democritus Junior
Some advanced into placental forms.
"The Whence and the Whither of Man" by John Mason Tyler
Placental vessels inserted into the arteries of the mother.
"Zoonomia, Vol. I" by Erasmus Darwin
A placental embryo; 4.
"Lay Sermons, Addresses and Reviews" by Thomas Henry Huxley
Hi placuere tibi, placeat devotio nostra; Rex bone, Rex clemens, cui bona cuncta placent.
"The St. Gregory Hymnal and Catholic Choir Book" by Various
Sunt hic plura sacra, sunt hic mundalia plura: Ex his si qua placent carmina, tolle, lege.
"The Care of Books" by John Willis Clark
Then we divide Theriogoea into (1) the land of Marsupials (Australia) and (2) the land of Placentals (the rest of the world).
"More Science From an Easy Chair" by Sir E. Ray (Edwin Ray) Lankester
The great Tertiary volume corresponds to those volumes of Cuvier which treat of the placental animals that suckle their young.
"The Testimony of the Rocks" by Hugh Miller
No female was recorded to have contained embryos, but two had enlarged uteri or placental scars.
"Mammals of Mesa Verde National Park, Colorado" by Sydney Anderson

In news:

You find the aborted fetus or the cow with placental membranes hanging from the vulva.
This fossil is believed to be the earliest placental mammal ever discovered.
Most of the genetic difference between marsupials and placental mammals comes from non-coding sequences, not proteins, according to the first marsupial genome sequence, unveiled in this week's Nature.
Carrie called into the show to ask our advice about eating her own placent after she gives birth what do you think.
"Human placental capsules that make treatment claims … must be accompanied by well-designed and controlled clinical studies to support approval/licensure," Mejia wrote in an e-mail.
The researchers also treated placental cultures with several strains of HIV and found that when they added "minute quantities of LIF to the cultures, HIV replication was blocked.".
As repeat cesareans increase, so do placental abnormalities.
A woman with terminal bone marrow failure was saved at the Hadassah Medical Center with placental stem cell therapy, marking the second successful treatment of a patient with this life-threatening medical condition in three months.
Biologists call the first group placental mammals and the second group marsupial mammals.
Tetraploid embryos are unable to develop beyond the placental stage, but injecting the reprogrammed stem-cells into the tetraploid embryo allowed it to develop into a live, late-gestation fetus.

In science:

It has also been argued that in the mid-infrared it is difficult to tell if one is observing dust emission from a circumstellar accretion disk or dust emission from the placental envelope (Vinkovi´c et al. 2000).
A Search for H2 Outflow Signatures from Massive Star Formation Regions Containing Linearly Distributed Methanol Masers
The far-infrared and sub-millimeter can probe the cool thermal emission from a dust disk with minimal contamination from the placental envelope, however no far-infrared facility exists that has the sub-arcsecond resolution to observe disks around these sources.
A Search for H2 Outflow Signatures from Massive Star Formation Regions Containing Linearly Distributed Methanol Masers
They clearly show that even nuclear sequences of placental mammals are prone to significant base composition shifts.
Measuring Fit of Sequence Data to Phylogenetic Model: Gain of Power using Marginal Tests
Japan. Waddell, P.J., N. Okada, and M. Hasegawa. 1999. Towards resolving the interordinal relationships of placental mammals.
Measuring Fit of Sequence Data to Phylogenetic Model: Gain of Power using Marginal Tests
Evol. 8: 398-414. Waddell, P. J., S. Umehara, K.-C. Griche and H. Kishino. (2006). Quantitative Assessments of Genome-Wide Indels Support Atlantogenata at the Root of Placental Mammals. RM 1022, Institute of Statistical Mathematics, Tokyo. Waters, P.D., G.
Measuring Fit of Sequence Data to Phylogenetic Model: Gain of Power using Marginal Tests