Synset:umbilical vesicle vesicula umbilicus vitelline sac
Hypernyms:sac
Inherited Hypernyms:yolk sacsaccavitystructurebody partpartthingphysical entityentity
| 单词 | yolk sac |
| 释义 | Yolk Sac nnoun.animalmembranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional Synset:umbilical vesicle vesicula umbilicus vitelline sac Hypernyms:sac Inherited Hypernyms:yolk sacsaccavitystructurebody partpartthingphysical entityentity nnoun.animalmembranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo Hypernyms:sac Inherited Hypernyms:yolk sacsaccavitystructurebody partpartthingphysical entityentity |
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