noun, plural pla·cen·tas, pla·cen·tae [pluh-sen-tee] /pləˈsɛn ti/.
- the part of the ovary of flowering plants that bears the ovules.
- (in ferns and related plants) the tissue giving rise to sporangia.
Origin of placenta
Examples from the Web for placenta
Nothing much to use in cleaning up the baby and his mother after the birth, no place to dispose of the placenta.
Usually, the disease resolves with the birth of the baby and placenta.Beyond ‘Downton Abbey’: Preeclampsia Maternal Deaths Continue Today|Eleni Tsigas, Christine Morton|January 28, 2013|DAILY BEAST
It normally occurs during weeks six and eight of pregnancy, when the placenta takes over production of hormones from the ovaries.What Exactly Is Wrong With Kate (And Is She Vomiting Blood?) Experts Rush To Explain...|Tom Sykes|December 3, 2012|DAILY BEAST
You get the biting of the placenta and you get Renesmee biting her without necessarily seeing it.Bill Condon and Melissa Rosenberg on 'Twilight Saga: Breaking Dawn'|Marlow Stern|November 21, 2011|DAILY BEAST
High levels could damage sensitive cells in the placenta and breast tissue with life-long consequences for the offspring.
Not only was the placenta unusually large in these flowers, but it also protruded beyond the ovary.Vegetable Teratology|Maxwell T. Masters
The placenta appears first to draw this nutriment, to convert this milk into blood, and to carry it to the fœtus by veins.Buffon's Natural History, Volume III (of 10)|Georges Louis Leclerc, Comte de Buffon
At this point of the womb, a cord is formed, containing a vein and artery, called the placenta.Self Knowledge and Guide to Sex Instruction|T. W. Shannon
In some cases I have been induced, from the symptoms, to believe that the placenta was at the os uteri when it was not.
The part by which the ovule is attached to the placenta or cord is its base or hilum, the opposite extremity being its apex.
British Dictionary definitions for placenta
noun plural -tas or -tae (-tiː)
- the part of the ovary of flowering plants to which the ovules are attached
- the mass of tissue in nonflowering plants that bears the sporangia or spores
Word Origin for placenta
Word Origin and History for placenta
1670s of plants, 1690s of mammals, from Modern Latin placenta uterina "uterine cake" (so called 16c. by Italian anatomist Realdo Colombo), from Latin placenta "a cake, flat cake," from Greek plakoenta, accusative of plakoeis "flat," related to plax (genitive plakos) "level surface, anything flat," from PIE *plak- (1) "to be flat" (cf. Greek plakoeis "flat," Lettish plakt "to become flat," Old Norse flaga "layer of earth," Norwegian flag "open sea," Old English floh "piece of stone, fragment," Old High German fluoh "cliff"), extended form of root *pele- (2) "flat, to spread" (see plane (n.1)). So called from the shape.
Medicine definitions for placenta
n. pl. pla•cen•tas
Science definitions for placenta
Culture definitions for placenta
An organ that forms in the uterus after the implantation of a zygote. The placenta moves nourishment from the mother's blood to the embryo or fetus; it also sends the embryo or fetus's waste products into the mother's blood to be disposed of by the mother's excretory system. The embryo or fetus is attached to the placenta by the umbilical cord. After birth, the placenta separates from the uterus and is pushed out of the mother's body.