Definition of endorphin
Origin of endorphin
International Scientific Vocabulary endogenous + metersorphine
First Known Use: 1976
Medical Definition of endorphin
: any of a group of endogenous peptides (as enkephalin and dynorphin) found especially in the brain that bind chiefly to opiate receptors and produce some of the same pharmacological effects (as pain relief) as those of opiates; specifically : beta-endorphin
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