Allantois meaning

ə-lăn'tō-ĭs
A membranous sac that develops from the posterior part of the digestive tract in the embryos of mammals, birds, and reptiles. It is important in the formation of the umbilical cord and placenta in mammals.
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A membranous pouch with a rich blood supply in the embryos of birds, reptiles, and mammals: it is an organ of respiration and excretion for embryonic birds and reptiles: in mammals it helps form the placenta.
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A membranous sac that develops from the posterior part of the digestive tract in the embryos of mammals, birds, and reptiles. It is important in the formation of the umbilical cord and placenta in mammals.
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A membranous sac that grows out of the lower end of the alimentary canal in embryos of reptiles, birds, and mammals. In mammals, the blood vessels of the allantois develop into the blood vessels of the umbilical cord.
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(anatomy) A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles.
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Origin of allantois

  • New Latin allāntois from allāntoīdes from Greek allāntoeidēs sausage-shaped allās allānt- sausage -oeidēs -oid
    From American Heritage Dictionary of the English Language, 5th Edition