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endogenous definition: The definition of endogenous is coming from the inside. (adjective) An example of something endogenous is a tumor that is caused by conditions inside the body not by externally-introduced conditions such as smoking. ...
Tweet. : any of a group of endogenous peptides (as enkephalin) found especially in the brain that bind chiefly to opiate receptors and produce some pharmacological effects (as pain relief) like those of opiates; specifically: beta-endorphin.edical 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.