1. 
   Opioid
   Scientific term denoting both natural and synthetic opiates or opium derived drugs. Opioids are strong analgesics.
   Found op http://thewellnessshop.co.uk/healthandwellbeing/glossary.html
   
   
2. 
   Opioid
   A strong, painkilling drug that is similar to endorphins. The body makes endorphins in response to pain. Opioid drugs were originally made from opium poppies and can now be man made in the laboratory. Types of opioid include morphine, fentanyl, diamorphine and codeine.
   Found op http://www.cancerhelp.org.uk/utilities/glossary/index.htm?search=o
   
   
3. 
   Opioid
   Substance with pharmacological action like that of opium or its derivatives. Some people believe that some of the symptoms of ASDare caused by the build up of opiods in the bodies of people with ASD.
   Found op http://www.researchautism.net/glossary.ikml?l=o
   
   
4. 
   Opioid
   Opioid: 1. A synthetic narcotic that resembles the naturally occurring opiates. 2. Any substance that binds to or otherwise affects the opiate receptors on the surface of the cell.
   Found op http://www.medterms.com/script/main/art.html?articlekey=13744
   
   
5. 
   opioid
   Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?opioid
   
   
6. 
   opioid
   (o´pe-oid) any synthetic narcotic that has opiatelike activities but is not derived from opium. denoting naturally occurring peptides, such as enkephalins, that exert opiate-like effects by interacting with opiate receptors of cell membranes. See also opioid analgesic.
   Found op http://www.encyclo.co.uk/local/21001
   
   
7. 
   Opioid
   An opioid is a psychoactive chemical that works by binding to opioid receptors, which are found principally in the central and peripheral nervous system and the gastrointestinal tract. The receptors in these organ systems mediate both the beneficial effects and the side effects of opioids. Opioids ...
   Found op http://en.wikipedia.org/wiki/Opioid
   
   
8. 
   opioid
   Type: Term Pronunciation: ō′pē-oyd Definitions: 1. Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=63021
   
   
9. 
   opioid
   A substance used to treat moderate to severe pain. Opioids are like opiates, such as morphine and codeine, but are not made from opium. Opioids bind to opioid receptors in the central nervous system. Opioids used to be called narcotics. An opioid is a type of alkaloid.
   Found op http://www.cancer.gov/dictionary?expand=O
   
   
10. 
    opioid
    1) Sedative substance
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/opioid/1
    
    

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