Definitions for placenta
pləˈsɛn təpla·cen·ta

Princeton's WordNetRate this definition:4.0 / 1 vote

1. placentanoun

   that part of the ovary of a flowering plant where the ovules form

2. placentanoun

   the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus

WiktionaryRate this definition:4.0 / 1 vote

1. placentanoun

   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.

2. placentanoun

   In flowering plants, the part of the ovary where ovules develop; in non-flowering plants where the spores develop.

WikipediaRate this definition:0.0 / 0 votes

1. Placenta

   The placenta is a temporary embryonic and later fetal organ that begins developing from the blastocyst shortly after implantation. It plays critical roles in facilitating nutrient, gas and waste exchange between the physically separate maternal and fetal circulations, and is an important endocrine organ, producing hormones that regulate both maternal and fetal physiology during pregnancy. The placenta connects to the fetus via the umbilical cord, and on the opposite aspect to the maternal uterus in a species-dependent manner. In humans, a thin layer of maternal decidual (endometrial) tissue comes away with the placenta when it is expelled from the uterus following birth (sometimes incorrectly referred to as the 'maternal part' of the placenta). Placentas are a defining characteristic of placental mammals, but are also found in marsupials and some non-mammals with varying levels of development.Mammalian placentas probably first evolved about 150 million to 200 million years ago. The protein syncytin, found in the outer barrier of the placenta (the syncytiotrophoblast) between mother and fetus, has a certain RNA signature in its genome that has led to the hypothesis that it originated from an ancient retrovirus: essentially a virus that helped pave the transition from egg-laying to live-birth.The word placenta comes from the Latin word for a type of cake, from Greek πλακόεντα/πλακοῦντα plakóenta/plakoúnta, accusative of πλακόεις/πλακούς plakóeis/plakoús, "flat, slab-like", with reference to its round, flat appearance in humans. The classical plural is placentae, but the form placentas is more common in modern English.

ChatGPTRate this definition:0.0 / 0 votes

1. placenta

   The placenta is a temporary organ that develops within the uterus of female mammals during pregnancy. It is responsible for providing oxygen and nutrients to the developing fetus, while also removing waste products from the fetus's blood. The placenta connects to the fetus through the umbilical cord and separates the mother's blood from the fetus's blood, but allows substances to be exchanged between the two. In addition, the placenta also produces hormones that support pregnancy. This organ is expelled from the body after childbirth.

Webster DictionaryRate this definition:4.0 / 1 vote

1. Placentanoun

   the vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth

2. Placentanoun

   the part of a pistil or fruit to which the ovules or seeds are attached

3. Etymology: [L., a cake, Gr. a flat cake, from flat, fr. , , anything flat and broad.]

WikidataRate this definition:0.0 / 0 votes

1. Placenta

   The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply. "True" placentas are a defining characteristic of eutherian or "placental" mammals, but are also found in some snakes and lizards with varying levels of development up to mammalian levels. Note, however, that the homology of such structures in various viviparous organisms is debatable at best and, in invertebrates such as Arthropoda, is definitely analogous at best. The word placenta comes from the Latin word for cake, from Greek plakóenta/plakoúnta, accusative of plakóeis/plakoús – πλακόεις, πλακούς, "flat, slab-like", in reference to its round, flat appearance in humans. The classical plural is placentae, but the form placentas is common in modern English and probably has the wider currency at present. In pre-Roman languages of tribal cultures, the placenta is often referred to the "little mother" or "grandmother," reflective of cultural values that revered the life mystery inherent in the childbearing process which bears fruit in the form of a child. Prototherial and metatherial mammals produce a choriovitelline placenta that, while connected to the uterine wall, provides nutrients mainly derived from the egg sac.

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. 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.]

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Placenta

   A highly vascularized mammalian fetal-maternal organ and major site of transport of oxygen, nutrients, and fetal waste products. It includes a fetal portion (CHORIONIC VILLI) derived from TROPHOBLASTS and a maternal portion (DECIDUA) derived from the uterine ENDOMETRIUM. The placenta produces an array of steroid, protein and peptide hormones (PLACENTAL HORMONES).

Editors ContributionRate this definition:0.0 / 0 votes

1. placenta

   Is an organ.

   The placenta is a vital organ that connects a fetus to their mother.

   
   

   Submitted by MaryC on March 1, 2016  

Matched Categories

1. • Reproductive Structure
   • Vascular Structure

Anagrams for placenta »

1. Tlapanec

How to pronounce placenta?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say placenta in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of placenta in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of placenta in Pythagorean Numerology is: 9

Examples of placenta in a Sentence

1. Kim Kardashian:

   Right after delivery, the placenta usually then comes out. Kim Kardashian did not, my placenta stayed attached inside my uterus, which is a condition called placenta accreta. This is a high-risk condition that happens when the placenta grows too deeply into the uterine wall.

2. Kjersti Aagaard:

   Humans, like all placental mammals, run the risk of bleeding to death after that placenta separates off the wall of the uterus, so 4.5 million years of evolution is at our backs, helping us clot a little bit more effectively when we're pregnant.

3. Lukasiewicz Hagai:

   We've been investigating the placenta for the last decade and we have discovered that the placenta cells have unique properties that can help the body to recover after exposure to high level of radiation, we are injecting these cells to the bodies' muscles...that will help the bone marrow to recover after radiation.

4. John Berger:

   The past grows gradually around one, like a placenta for dying.

5. Sheryl Ross:

   The sooner you deliver the placenta, the sooner the uterus will clamp down and there will be less of a concern.

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=placenta
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Placenta
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Placenta
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/placenta
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=placenta
7. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=placenta