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Webster's New World College Dictionary » endorphin
endorphin
endorphin definition
en·dor·phin (en dôr′fin)
noun
any of several peptides secreted in the brain that have a pain-relieving effect like that of morphine
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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