noun Etymology: enkephal- (alteration of encephal-) + -in Date: 1975 either of two pentapeptides with opiate and analgesic activity that occur naturally especially in the brain and have a marked affinity for opiate receptors
ENKEPHALIN
Meaning of ENKEPHALIN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012