noun Etymology: International Scientific Vocabulary endogenous + morphine Date: 1976 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
ENDORPHIN
Meaning of ENDORPHIN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012