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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
ENKEPHALIN Dictionary entry overview: What does enkephalin mean? â¢ ENKEPHALIN (noun) The noun ENKEPHALIN has 1 sense: 1. an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere Familiarity information: ENKEPHALIN used as a noun is very rare.