opioid Hear it!

opioid definition

opi·oid (ō′pē o̵id′)

adjective

designating or of a group of natural or synthetic biochemicals, esp. endorphins, that relieve pain in the same way that opiates do

noun

any such biochemical

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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