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n. pl. pla·cen·tas or pla·cen·tae (-tē)
a. A membranous vascular organ that develops in female eutherian mammals during pregnancy, lining the uterine wall and partially enveloping the fetus, to which it is attached by the umbilical cord. Following birth, the placenta is expelled.
b. A similar organ in marsupial mammals, consisting of a yolk sac attached to the uterine wall.
c. An organ with similar functions in some nonmammalian animals, such as certain sharks and reptiles.
2. Botany The part within the ovary of a flowering plant to which the ovules are attached.

[New Latin, from Latin, flat cake, alteration of Greek plakoenta, from accusative of plakoeis, flat, from plax, plak-, flat land, surface; see plāk- in Indo-European roots.]

pla·cen′tal adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(pləˈsɛntəl) or


(Zoology) (esp of animals) having a placenta: placental mammals. See also eutherian
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.placental - mammals having a placentaplacental - mammals having a placenta; all mammals except monotremes and marsupials
mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
Eutheria, subclass Eutheria - all mammals except monotremes and marsupials
farm animal, livestock, stock - any animals kept for use or profit
bull - mature male of various mammals of which the female is called `cow'; e.g. whales or elephants or especially cattle
cow - mature female of mammals of which the male is called `bull'
yearling - an animal in its second year
buck - mature male of various mammals (especially deer or antelope)
doe - mature female of mammals of which the male is called `buck'
insectivore - small insect-eating mainly nocturnal terrestrial or fossorial mammals
aquatic mammal - whales and dolphins; manatees and dugongs; walruses; seals
carnivore - a terrestrial or aquatic flesh-eating mammal; "terrestrial carnivores have four or five clawed digits on each limb"
Fissipedia - in some classifications considered a suborder of Carnivora
aardvark, Orycteropus afer, ant bear, anteater - nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata
bat, chiropteran - nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate
gnawing mammal, lagomorph - relative large gnawing animals; distinguished from rodents by having two pairs of upper incisors specialized for gnawing
gnawer, rodent - relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing
Ungulata - in former classifications a major division of Mammalia comprising all hoofed mammals; now divided into the orders Perissodactyla (odd-toed ungulates) and Artiodactyla (even-toed ungulates)
hoofed mammal, ungulate - any of a number of mammals with hooves that are superficially similar but not necessarily closely related taxonomically
Unguiculata - in former classifications a major division of Mammalia comprising mammals with nails or claws; distinguished from hoofed mammals and cetaceans
unguiculate, unguiculate mammal - a mammal having nails or claws
cony, das, dassie, hyrax, coney - any of several small ungulate mammals of Africa and Asia with rodent-like incisors and feet with hooflike toes
pachyderm - any of various nonruminant hoofed mammals having very thick skin: elephant; rhinoceros; hippopotamus
edentate - primitive terrestrial mammal with few if any teeth; of tropical Central America and South America
anteater, pangolin, scaly anteater - toothless mammal of southern Africa and Asia having a body covered with horny scales and a long snout for feeding on ants and termites
primate - any placental mammal of the order Primates; has good eyesight and flexible hands and feet
tree shrew - insectivorous arboreal mammal of southeast Asia that resembles a squirrel with large eyes and long sharp snout
colugo, flying cat, flying lemur - arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps
proboscidean, proboscidian - massive herbivorous mammals having tusks and a long trunk
plantigrade, plantigrade mammal - an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings
digitigrade, digitigrade mammal - an animal that walks so that only the toes touch the ground as e.g. dogs and cats and horses
Adj.1.placental - pertaining to or having or occurring by means of a placenta; "all mammals except monotremes and marsupials are placental mammals"
aplacental - having no placenta; "monotremes and marsupials are aplacental mammals"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


a. placentario-a, de la placenta.
English-Spanish Medical Dictionary © Farlex 2012


adj placentario; — abruption desprendimiento prematuro de placenta
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
GH-1 is expressed in somatotroph cells of pituitary whereas other paralogues are all placentally expressed.
She had experienced a relatively short period of fasting/poor nutritional intake due to the nausea and vomiting in conjunction with a relative insulin-deficient state associated with pregnancy (which is maximal in the third trimester), largely attributed to counter-regulatory, placentally derived hormones that are up-regulated during periods of stress, further aggravating the metabolic derangement.
Morrison, "Regulation of lung maturation by prolyl hydroxylase domain inhibition in the lung of the normally grown and placentally restricted fetus in late gestation," American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, vol.
Rh-D haemolytic disease of foetus and newborn (HDFN) is an ailment in which lifespan of infant's erythrocytes were shortened by the action of placentally transferred maternal anti-D specific for inherited paternal red cell antigens.
canals in the landscape, to become an appendage of the wolf, placentally
Warner et al., "Placentally derived prostaglandin E2 acts via the EP4 receptor to inhibit IL-2-dependent proliferation of CTLL-2 t cells," Clinical and Experimental Immunology, vol.
The purpose of this study was to determine if methylmercury is maternally transferred placentally in Northern Water Snakes (Nerodia sipedon).
In this regard, circulating fetal DNA, which is placentally derived and thus nonhematopoietic in origin, exhibits size characteristics that are the same as the nonhematopoietically derived DNA in the transplantation models investigated in this study.
In conclusion, PARV4 can be transmitted parenterally and placentally. Other transmission routes might exist and remain to be discovered.
Much of the focus of cow management has been on the perinatal period as the calf prepares for delivery into a totally foreign environment in which placentally derived nutrition is replaced by the initial lacteal secretion from the mammary gland, colostrum.
Serious neurologic complications can occur with placental transmission of zoonotic organisms such as Listeria monocytogenes and Toxoplasma gondii in which the mother contracted the disease from an animal and placentally transmitted it to her fetus.
While birds have evolved with hemp seed in their diets, human infants have only been exposed placentally and via breast-feeding to PBDEs and PCBs for the last forty years, but at an exponentially growing rate for the former.