allantois

A1L1L1A1N1T1O1I1S1
/əˈlæntəʊ.ɪs/

noun

A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles.

Similar
allantoic sacallantoid
OriginAncient Greek ἀλλαντοειδής →
Scrabble 9
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Meanings

nounallantois (plural allantoises or allantoides)

plural allantoises · plural allantoides

  1. anatomyA sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles.

    Synonyms: allantoic sac, allantoid

Synonyms & antonyms

nounA sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles.

Similar
allantoic sacallantoid

Origin

  1. Ancient Greekἀλλαντοειδής“sausage-shaped”
  2. Englishallantois

Ancient Greek ἀλλαντοειδής (allantoeidḗs, “sausage-shaped”). Compare Greek αλλαντικό (allantikó).

More words from Ancient Greek

Full word history & related roots →

Translations

Arabic سِقَاء
  • سِقَاء (siqāʔ)sac in the alimentary canal of the embryos of mammals, birds and reptiles
Czech močová blána, alantois
  • močová blánasac in the alimentary canal of the embryos of mammals, birds and reptiles
  • alantoissac in the alimentary canal of the embryos of mammals, birds and reptiles
Finnish rakkokalvo
  • rakkokalvosac in the alimentary canal of the embryos of mammals, birds and reptiles
French allantoïde
  • allantoïdesac in the alimentary canal of the embryos of mammals, birds and reptiles
German Allantois
  • Allantoissac in the alimentary canal of the embryos of mammals, birds and reptiles
Irish allantóis
  • allantóissac in the alimentary canal of the embryos of mammals, birds and reptiles
Italian allantoide
  • allantoidesac in the alimentary canal of the embryos of mammals, birds and reptiles
Japanese 尿膜
  • 尿膜 (nyoumaku)sac in the alimentary canal of the embryos of mammals, birds and reptiles
Latin allantoīs
  • allantoīssac in the alimentary canal of the embryos of mammals, birds and reptiles
Polish omocznia
  • omoczniasac in the alimentary canal of the embryos of mammals, birds and reptiles
Portuguese alantoide
  • alantoidesac in the alimentary canal of the embryos of mammals, birds and reptiles
Russian алланто́ис
  • алланто́ис (allantóis)sac in the alimentary canal of the embryos of mammals, birds and reptiles
Swedish urinsäck, allantois
  • urinsäcksac in the alimentary canal of the embryos of mammals, birds and reptiles
  • allantoissac in the alimentary canal of the embryos of mammals, birds and reptiles
Cite this entry
APA

allantois. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/allantois

MLA

“allantois.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/allantois. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “allantois,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/allantois.

Source: allantois on Wiktionary, CC BY-SA 4.0.