WordReference Random House Unabridged Dictionary of American English © 2017
be•ta-en•dor•phin  (bā′tə en dôrfin or, esp. Brit., bē′-),USA pronunciation n. 
  1. Biochemistrya potent endorphin released by the anterior pituitary gland in response to pain, trauma, exercise, or other forms of stress.
  • 1975–80

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