Allantois
nounverified·updated May 18, 2026
the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
Classifications
Entity Type
Unknown—glossary_import_default_pending_classifier
?unassignedlast reviewed —
Sensitivity
unclassified
Information Class
unclassified
Variants
- possessive
- Allantois's
- pluralpossessive
- Allantoises'