Dictionary
be•ta-en•dor•phin
Pronunciation: (bā"tu en-dôr'fin or, esp. Brit., bē"-), [key]—
n.
a potent endorphin released by the anterior pituitary gland in response to pain, trauma, exercise, or other forms of stress.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.