opioid
Pronunciation
  • (British) IPA: /ˈəʊpiɔɪd/
Noun

opioid (plural opioids)

  1. A substance that has effects similar to opium.
  2. (physiology) Any of the natural substances, such as an endorphin, released in the body in response to pain.
  3. (pharmacology) Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature.
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