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OPIC
opine
opinion
opinion poll
opinion shopping
opinionated
opinionative
opioid
opioid peptide
opisthobranch
opisthognathous
opisthotonus
opium
opium den
opium poppy
OPM
Oporto
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opioid peptide
o·pi·oid pep·tide (plural o·pi·oid pep·tides)


noun 
Definition:
 
naturally occurring pain reliever: a naturally occurring peptide that has pain-relieving and sedative effects. The endorphins are opioid peptides.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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