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blood medical definition
noun
- The fluid consisting of plasma, red blood cells, white blood cells, and platelets that is circulated by the heart through the arteries and veins, carrying oxygen and nutrients to and waste materials away from all body tissues.
- One of the four humors of ancient and medieval physiology, identified with the blood found in the blood vessels, and believed to cause cheerfulness.
- Descent from a common ancestor; parental lineage.
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