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Cardio-
2. Relating to the cardial orifice, which is a trumpet shaped opening of the esophagus (the tube that food goes down) into the stomach. Cardio- comes from the Greek word "kardia" meaning "heart."
1. Relating to the heart. As an example, see cardiology, which is the study of the structure, functions, and disorders of the heart and blood vessels, as well as the diagnosis and treatment of such disorders. Blood vessels are tube-shaped structures in the body that carry blood.
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