Definitions

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

Etymologies

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)

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