Definition of placenta Placenta
/plʌsɛˈntʌ/ - [plusentu] - pla•cen•ta
We found 11 definitions of placenta from 7 different sources.
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What does placenta mean?
WordNet
NounPlural: placentas |
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| placenta - the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus | ||
| vascular structure a structure composed of or provided with blood vessels | ||
| uterus, womb a hollow muscular organ in the pelvic cavity of females; contains the developing fetus | ||
| embryonic membrane, caul, veil the inner membrane of embryos in higher vertebrates (especially when covering the head at birth) | ||
| placenta - that part of the ovary of a flowering plant where the ovules form | ||
| reproductive structure the parts of a plant involved in its reproduction | ||
| ovary (vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone | ||
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Wiktionary 
- placenta (Noun)
A vascular organ in mammals, except monotremes and marsupials, present only in the female during gestation. It supplies food and oxygen from the mother to the foetus, and passes back waste. It is implanted in the wall of the uterus and links to the foetus through the umbilical cord . It is expelled after birth. - placenta (Noun)
In flowering plants, the part of the ovary where ovules develop; in non-flowering plants where the spores develop.
Webster DictionaryWebster's Unabridged Dictionary 📘
- placenta (n.)
The vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth. - placenta (n.)
The part of a pistil or fruit to which the ovules or seeds are attached.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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placenta
That part of the ovary of a flowering plant where the ovules form. -
placenta
The vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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placenta
pla-sen′ta, n. the structure which unites the unborn mammal to the womb of its mother and establishes a nutritive connection between them: (bot.) the portion of the ovary which bears the ovules:—pl. Placen′tæ.—adj. Placen′tal.—n.pl. Placentā′lia, placental mammals.—adjs. Placentā′lian; Placen′tary, pertaining to, or having, a placenta.—n. a mammal having a placenta.—adjs. Placen′tate, Placentif′erous.—ns. Placentā′tion, the mode in which the placenta is formed and attached to the womb; Placentī′tis, inflammation of the placenta. [L., a flat cake, akin to Gr. plakous, a flat cake, from plax, plak-os, anything flat.]
Wikipedia 
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The placenta is a temporary organ found in most female mammals while they are pregnant.
The mother's and baby's blood never mixes. That is why the placenta is necessary. It acts as an exchange surface between the mother and baby, and nutrients and oxygen are passed over by diffusion only. If the mother and baby blood mixes, it could be deadly for both the mother and the baby. If the mother is blood type A for example and the blood type of the baby is B, then different type blood will mix and the mother and baby would both die.
The placenta is connected to the fetus by the umbilical cord which is made of blood vessels and connective tissue. When the fetus is delivered, the placenta is delivered afterwards, and is often called the afterbirth.
The placenta has two parts, one of which is genetically and biologically part of the fetus, the other part of the mother. It is implanted in the wall of the uterus, where it receives nutrients and oxygen from the mother's blood and passes out waste. This forms a barrier called the placental barrier, which filters out some substances which could harm the fetus. However, many other substances are not filtered out, including alcohol and some chemicals associated with smoking cigarettes. Several types of viruses may also cross this barrier.
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