from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a group of peptide hormones that bind to opiate receptors and are found mainly in the brain. Endorphins reduce the sensation of pain and affect emotions.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a group of peptide hormones found in the brain that act as neurotransmitters and have properties similar to morphine.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a neurochemical occurring naturally in the brain and having analgesic properties
endo(genous) + (mo)rphin(e).(American Heritage® Dictionary of the English Language, Fourth Edition)
From French endorphine, from endo(gène) ‘endogenous’ + (mo)rphine ‘morphine’. (Wiktionary)