Yolk Sac
nounverified·updated May 18, 2026
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
polysemousMWEWordset Dictionary
Senses
Wordset Dictionary
membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes
Classifications
Entity Type
Unknown—glossary_import_default_pending_classifier
?unassignedlast reviewed —
Sensitivity
unclassified
Information Class
unclassified
Variants
- synonym
- umbilical vesiclevitelline sac
- plural
- Yolk Sacs
- possessive
- Yolk Sac's
- pluralpossessive
- Yolk Sacs'