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allantois

4 senses · Free VividLex dictionary · Thesaurus

  1. 1. n. Alt. of Allantoid Source: opted
  2. 2. n. the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) Source: wordnet
  3. 3. A membranous appendage of the embryos of mammals, birds, and reptiles, -- in mammals serving to connect the fetus with the parent; the urinary vesicle. Source: webster
  4. 4. n. the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) Source: ecdict

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mammalsbirdsreptilesbelowchoriondevelopsembryonicfetalhigherhindgutliesmembranevascularvertebratesallantoidaltappendageconnectembryosfetusmembranousparentservingurinary

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