Definition of allantois Allantois

al•lan•to•is

We found 6 definitions of allantois from 6 different sources.

What does allantois mean?

WordNet

Noun

Plural: allantoises

allantois - the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)

fetal membrane any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus

= synonym
= antonym
= related word

Wiktionary

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

Webster DictionaryWebster's Unabridged Dictionary 📘

allantois (n.)
Alt. of Allantoid

OmegaWiki DictionaryOmegaWiki Dictionary Ω

allantois
A tubular extension of the embryonic hindgut and cloaca; becomes the urachus, a fibrous cord attached to the adult bladder.

Chambers DictionaryChamber's 20th Century Dictionary 📕

allantois
a-lan′tō-is, n. a membranous sac-like appendage for effecting oxygenation in the embryos of mammals, birds, and reptiles.—adjs. Allantō′ic, Allan′toid. [Gr. allas, a sausage.]