noun
the system of blood vessels and structures through which blood moves in a fetus
• Syn: ↑foetal circulation
• Hypernyms: ↑circulatory system, ↑cardiovascular system
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noun : the course of the blood in the vessels of the fetus, impure blood passing in man and the higher mammals to the placenta by the umbilical arteries, returning purified and charged with nutriment by the umbilical vein, and entering the inferior vena cava either directly by the ductus venosus or after passing through the liver
Useful english dictionary. 2012.