Search Result：vitelline sac
vitelline sac 
(TTS Sound)
(TTS Sound)Overview of noun vitelline_sac
The noun vitelline sac has 1 sense
- yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus -- (membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional)