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Definitions of placenta

  1. the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus Scrapingweb Dictionary DB
  2. The vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth. Webster Dictionary DB
  3. The spongy organ connecting the fetus in the womb with the mother: (bot.) the part of a plant to which the seeds are attached:-pl. PLACENTAE. The american dictionary of the english language. By Daniel Lyons. Published 1899.
  4. A temporary organ that connects the embryo or foetus to the womb; the afterbirth; the part of a plant to which the seeds are attached. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
  5. In anat., the roundish, flat, flesh-like substance in the womb, forming the principal medium of communication between the parent and child, and which, being expelled after the birth, is popularly called the after-birth; in bot., the cellular part of the carpel bearing the ovule. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  6. The ovule-bearing part of the carpel; in eutherian Mammals, a double vascular spongy structure formed by interlocking of foetal and maternal tissue in the uterus, and in which maternal and foetal blood are in close proximity, allowing nutritive and respiratory elements to pass from the former to the latter by osmosis. A dictionary of scientific terms. By Henderson, I. F.; Henderson, W. D. Published 1920.