allantoisn.

Brit.

/əˈlantəʊɪs/, U.S.

/əˈlæntəwəs/

Inflections: Plural allantoides.

Forms: 1600s– alantois, 1600s– allantois, 1800s allantoïs.

Origin: A borrowing from Latin. Etymon: Latin allantois.

Etymology: < post-classical Latin allantois (1556 or earlier), variant of allantoides (see allantoides n.), probably arising by interpretation of the latter form as a plural.

Embryology.

In amniotes: the fetal membrane that lies beneath the chorion, arising as a diverticulum from the hindgut of the embryo, and serving as a sac for the storage of urine and (with the chorion) as an organ of oxygen and carbon dioxide exchange. Also: a fetal membrane of this kind.The allantois is vestigial in many mammals, including humans, but plays an important part in the development of the umbilical blood supply.

ΘΚΠ

the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > membranes, etc., of embryo or fetus > [noun] > membranes enclosing

houve1530

kell1530

cotyledon1540

chorion1545

coif1545

hoop-caul1545

shirt1545

caul1547

sillyhow1574

biggin1611

guard1611

allantoides1615

allantois1615

allantoid1633

amnios1657

amnion1667

heam1681

vitta1693

indusium1706

silly-hood1836

1615 H. Crooke Μικροκοσμογραϕια ii. ii. 81 Finally, the Vrachus..or the vrinarie vessel in beasts, ariseth from the bottom of the bladder..and ascendeth betwixt the two arteries through the duplication of the Peritonæum, and issuing out at the nauill-stead is lengthned into two guts as it were, and maketh that coate of the creature which is called Alantois, into which the vrine of the Calfe is poured, which is there retained till it be calued.

1646 Sir T. Browne Pseudodoxia Epidemica 270 The Allantois is a thin coat seated under the Corion, wherein are received the watery separations conveyed by the Urachus.

1701 Philos. Trans. 1700–1 (Royal Soc.) 22 847 This Allantois..is of an Oviform Figure, somewhat like the common Cuts of a Mans Bladder.

1784 A. Hamilton Outl. Theory & Pract. Midwifery iv. 84 There is no allantois in the human subject.

1841 T. R. Jones Gen. Outl. Animal Kingdom xxx. 730 The placenta completely usurps the place of the allantois.

1886 Amer. Jrnl. Obstetr. & Dis. Women & Children 19 1213 In case of one-ovum twins, the primal chorionic vessels originate, not from one, but from two allantoides.

1925 R. S. Lull Ways of Life v. 133 This is accomplished within the egg by the development of a membrane, the allantois, which closely lines the interior of the porous shell.

1988 Mouse News Let. Nov. 101 Extra-embryonic structures, such as the yolk sac, amnion and allantois, appear largely unaffected.

2000 C. Tudge Variety of Life i. iii. 53 It may lay eggs or may produce live young, but in either case protects each embryo with a series of membranes known as the allantois, the chorion, and the amnion.

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	allantois
释义	allantoisn. Brit. /əˈlantəʊɪs/, U.S. /əˈlæntəwəs/ Inflections: Plural allantoides. Forms: 1600s– alantois, 1600s– allantois, 1800s allantoïs. Origin: A borrowing from Latin. Etymon: Latin allantois. Etymology: < post-classical Latin allantois (1556 or earlier), variant of allantoides (see allantoides n.), probably arising by interpretation of the latter form as a plural. Embryology. In amniotes: the fetal membrane that lies beneath the chorion, arising as a diverticulum from the hindgut of the embryo, and serving as a sac for the storage of urine and (with the chorion) as an organ of oxygen and carbon dioxide exchange. Also: a fetal membrane of this kind.The allantois is vestigial in many mammals, including humans, but plays an important part in the development of the umbilical blood supply. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > membranes, etc., of embryo or fetus > [noun] > membranes enclosing houve1530 kell1530 cotyledon1540 chorion1545 coif1545 hoop-caul1545 shirt1545 caul1547 sillyhow1574 biggin1611 guard1611 allantoides1615 allantois1615 allantoid1633 amnios1657 amnion1667 heam1681 vitta1693 indusium1706 silly-hood1836 1615 H. Crooke Μικροκοσμογραϕια ii. ii. 81 Finally, the Vrachus..or the vrinarie vessel in beasts, ariseth from the bottom of the bladder..and ascendeth betwixt the two arteries through the duplication of the Peritonæum, and issuing out at the nauill-stead is lengthned into two guts as it were, and maketh that coate of the creature which is called Alantois, into which the vrine of the Calfe is poured, which is there retained till it be calued. 1646 Sir T. Browne Pseudodoxia Epidemica 270 The Allantois is a thin coat seated under the Corion, wherein are received the watery separations conveyed by the Urachus. View more context for this quotation 1701 Philos. Trans. 1700–1 (Royal Soc.) 22 847 This Allantois..is of an Oviform Figure, somewhat like the common Cuts of a Mans Bladder. 1784 A. Hamilton Outl. Theory & Pract. Midwifery iv. 84 There is no allantois in the human subject. 1841 T. R. Jones Gen. Outl. Animal Kingdom xxx. 730 The placenta completely usurps the place of the allantois. 1886 Amer. Jrnl. Obstetr. & Dis. Women & Children 19 1213 In case of one-ovum twins, the primal chorionic vessels originate, not from one, but from two allantoides. 1925 R. S. Lull Ways of Life v. 133 This is accomplished within the egg by the development of a membrane, the allantois, which closely lines the interior of the porous shell. 1988 Mouse News Let. Nov. 101 Extra-embryonic structures, such as the yolk sac, amnion and allantois, appear largely unaffected. 2000 C. Tudge Variety of Life i. iii. 53 It may lay eggs or may produce live young, but in either case protects each embryo with a series of membranes known as the allantois, the chorion, and the amnion. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < n.1615
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