Noun, Noun which may take the genitive case particle 'no'
1. vein
Wikipedia definition
2. VeinIn the circulatory system, veins (from the Latin vena) are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.
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