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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
Medical Definition of LEPTIN. : a peptide hormone that is produced by fat cells and plays a role in body weight regulation by acting on the hypothalamus to suppress appetite and burn fat stored in adipose tissue.ADVERTISEMENT. Greek leptos slender + English 1-in.eptin. noun lepÂ·tin \Ëlep-tÉn\. : a peptide hormone that is produced by fat cells and plays a role in body weight regulation by acting on the hypothalamus to suppress appetite and burn fat stored in adipose tissue. Britannica.com: Encyclopedia article about leptin.