allantoideanadj.n.

Brit.

/ˌalənˈtɔɪdɪən/, U.S.

/ˌælənˈtɔɪdiən/

Forms:

α. 1800s allantoïdian, 1800s– allantoidian.

β. 1800s– allantoidean.

Origin: A borrowing from Latin, combined with an English element; partly modelled on a French lexical item. Etymons: Latin allantoideus , -an suffix.

Etymology: < post-classical Latin allantoideus (1555 or earlier; < allantoides (see allantoides n.) + -eus : see -eous suffix) + -an suffix. In α. forms after French allantoïdien (1817 or earlier).

A. adj.

†1. Zoology. Of a vertebrate: characterized by the presence during development of the allantois, or of fetal membranes generally; amniote. Obsolete.

ΚΠ

1848 L. Agassiz & A. A. Gould Princ. Zöol. x. 119 From one of these envelops, the allantoïs..is derived their common name of Allantoïdian Vertebrates, in opposition to the naked reptiles and fishes, which are called Anallantoïdian.

1854 Amer. Jrnl. Sci. 67 380 In the other Vertebrata, which are allantoïdian, these last [sc. Wolffian bodies] would be found.

1878 H. Dobell et al. Rep. Dis. Chest 3 153 As regards their vascular system, no distinction should be made between the allantoidean and the anallantoidean animals.

2. Embryology. = allantoic adj.

ΘΚΠ

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

allantoid1730

amniotic1822

cotyledonal1850

amnic1855

allantoidean1857

chorial1879

cotyledonary1888

chorionic1892

allantoica1933

intra-amniotic1960

1857 L. J. R. Agassiz Contrib. Nat. Hist. U.S.A. II. iii. ii. 542 It is recognizable not only by its relation to the other membranes, the embryonal membrane and the allantoidian sac, but also by its characteristic cellular structure.

1879 G. Fleming Text-bk. Vet. Obstetr. 78 The cavity of this sac is in communication with the interior of the bladder by means of the urachus: a narrow canal in the amniotic portion of the umbilical cord, and which widens at the origin of the allantoidean portion.

1904 Brit. Med. Jrnl. 6 Aug. 285/1 He found that glycogen first appeared in the maternal cells which overlie the allantoidean portion of the trophoblast.

1952 Marshall's Physiol. Reprod. (ed. 3) II. xv. 240 The allantoidean trophoblast is applied against the bell-shaped proliferation on the antimesometrial side of the uterus.

1994 C. Berthier & K. L. Schiffman tr. H. St-Girons in R. Bauchot Snakes 101/1 It never stops growing during embryonic development, and the allantoidian membrane finishes by lining the chorion.

B. n.

Zoology. A vertebrate characterized by the presence during development of the allantois, or of fetal membranes generally; an amniote. Now disused.

ΘΚΠ

the world > animals > vertebrates > [noun] > Amniota

allantoidean1859

amniota1879

amniote1887

1859 L. Agassiz Ess. Classif. iii. 330 (heading) Osteozoaria, or vertebrata. Sub-branch. Allantoidians.

1875 Harvard Univ. Catal. 1875–1876 257 What is the origin of the kidneys of adult Allantoidians?

1930 L. T. Hogben Princ. Animal Biol. x. 230 The Mammals, Birds and Reptiles..are grouped together, on account of the presence of fœtal membranes in development, as Allantoidians (Amniota of some later authors).

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

单词	allantoidean
释义	allantoideanadj.n. Brit. /ˌalənˈtɔɪdɪən/, U.S. /ˌælənˈtɔɪdiən/ Forms: α. 1800s allantoïdian, 1800s– allantoidian. β. 1800s– allantoidean. Origin: A borrowing from Latin, combined with an English element; partly modelled on a French lexical item. Etymons: Latin allantoideus , -an suffix. Etymology: < post-classical Latin allantoideus (1555 or earlier; < allantoides (see allantoides n.) + -eus : see -eous suffix) + -an suffix. In α. forms after French allantoïdien (1817 or earlier). A. adj. †1. Zoology. Of a vertebrate: characterized by the presence during development of the allantois, or of fetal membranes generally; amniote. Obsolete. ΚΠ 1848 L. Agassiz & A. A. Gould Princ. Zöol. x. 119 From one of these envelops, the allantoïs..is derived their common name of Allantoïdian Vertebrates, in opposition to the naked reptiles and fishes, which are called Anallantoïdian. 1854 Amer. Jrnl. Sci. 67 380 In the other Vertebrata, which are allantoïdian, these last [sc. Wolffian bodies] would be found. 1878 H. Dobell et al. Rep. Dis. Chest 3 153 As regards their vascular system, no distinction should be made between the allantoidean and the anallantoidean animals. 2. Embryology. = allantoic adj. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > membranes, etc., of embryo or fetus > [adjective] > membranes enclosing allantoid1730 amniotic1822 cotyledonal1850 amnic1855 allantoidean1857 chorial1879 cotyledonary1888 chorionic1892 allantoica1933 intra-amniotic1960 1857 L. J. R. Agassiz Contrib. Nat. Hist. U.S.A. II. iii. ii. 542 It is recognizable not only by its relation to the other membranes, the embryonal membrane and the allantoidian sac, but also by its characteristic cellular structure. 1879 G. Fleming Text-bk. Vet. Obstetr. 78 The cavity of this sac is in communication with the interior of the bladder by means of the urachus: a narrow canal in the amniotic portion of the umbilical cord, and which widens at the origin of the allantoidean portion. 1904 Brit. Med. Jrnl. 6 Aug. 285/1 He found that glycogen first appeared in the maternal cells which overlie the allantoidean portion of the trophoblast. 1952 Marshall's Physiol. Reprod. (ed. 3) II. xv. 240 The allantoidean trophoblast is applied against the bell-shaped proliferation on the antimesometrial side of the uterus. 1994 C. Berthier & K. L. Schiffman tr. H. St-Girons in R. Bauchot Snakes 101/1 It never stops growing during embryonic development, and the allantoidian membrane finishes by lining the chorion. B. n. Zoology. A vertebrate characterized by the presence during development of the allantois, or of fetal membranes generally; an amniote. Now disused. ΘΚΠ the world > animals > vertebrates > [noun] > Amniota allantoidean1859 amniota1879 amniote1887 1859 L. Agassiz Ess. Classif. iii. 330 (heading) Osteozoaria, or vertebrata. Sub-branch. Allantoidians. 1875 Harvard Univ. Catal. 1875–1876 257 What is the origin of the kidneys of adult Allantoidians? 1930 L. T. Hogben Princ. Animal Biol. x. 230 The Mammals, Birds and Reptiles..are grouped together, on account of the presence of fœtal membranes in development, as Allantoidians (Amniota of some later authors). This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.n.1848
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