placenta(redirected from membranous placenta)
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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.]
n, pl -tas or -tae (-tiː)
1. (Anatomy) the vascular organ formed in the uterus during pregnancy, consisting of both maternal and embryonic tissues and providing oxygen and nutrients for the fetus and transfer of waste products from the fetal to the maternal blood circulation. See also afterbirth
2. (Zoology) the corresponding organ or part in certain mammals
3. (Botany) botany
a. the part of the ovary of flowering plants to which the ovules are attached
b. the mass of tissue in nonflowering plants that bears the sporangia or spores
[C17: via Latin from Greek plakoeis flat cake, from plax flat]
n., pl. -tas, -tae (-tē).
1. the organ in most mammals, formed in the lining of the uterus by the union of the uterine mucous membrane with the membranes of the fetus, that provides for the nourishment of the fetus and the elimination of its waste products.
a. the part of the ovary of flowering plants that bears the ovules.
b. (in ferns and related plants) the tissue giving rise to sporangia.
[1670–80; < New Latin: something having a flat, circular form, Latin: a cake < Greek plakóenta, acc. of plakóeis flat cake, derivative of pláx (genitive plakós) flat]
1. The sac-shaped organ that attaches the embryo or fetus to the uterus during pregnancy in most mammals. It supplies the fetus with oxygen and nutrients and is expelled after birth.
2. Botany The part of the ovary of a flowering plant to which the ovules are attached.
An organ formed in the uterus during pregnancy to nourish the fetus and remove its waste products.
Switch to new thesaurus
|Noun||1.||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 - the organ that bears the ovules of a flower
|2.||placenta - the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus|
embryonic membrane, caul, veil - the inner membrane of embryos in higher vertebrates (especially when covering the head at birth)
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
afterbirth - the placenta and fetal membranes that are expelled from the uterus after the baby is born
placenta[pləˈsentə] N (placentas or placentae (pl)) [pləˈsentiː] → placenta f
n → Plazenta f
placenta[pləˈsɛntə] n → placenta
n. placenta, órgano vascular que se desarrolla en la pared del útero a través del cual el feto se nutre de la madre por medio del cordón umbilical;
abruptio ___ → L. abrupto placentae; annular ___ → ___ anular; decidiate ___ → ___ decidua; double ___ → ___ doble; ___ previa → ___ previa., localizada en el segmento uterino anterior.