Definition, Meaning & Synonyms
allantois
noun
/əˈlæn.təʊ.ɪs/
Definition
A membrane that forms the excretory system of embryos in reptiles, birds, and mammals.
Examples
- The allantois develops from the hindgut of the embryo.
- In birds, the allantois helps in respiration and excretion.
- The structure of the allantois can be observed early in the gestation of mammals.
Meaning
The allantois is involved in the exchange of gases and the storage of liquid waste in embryos, playing a crucial role in fetal development.
Synonyms
- None, as it is a specific embryonic structure unique to certain species.
