umbilical vein

umbilical vein

noun
a vein in the umbilical cord; returns nutrient blood from the placenta to the fetus 
WordNet® 3.0, © 2006 by Princeton University.
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Umbilical vein is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
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