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Cholecystokinin definition, a hormone secreted by the upper portion of the intestine that stimulates contraction of the gallbladder and increases secretion of pancreatic juice. See more. Dictionary.com
Definition of HEMOGLOBIN for Kids. : a protein of red blood cells that contains iron and carries oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs. a protein of red blood cells that contains iron and carries oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs.