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.
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Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics.

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opi·oid 'ō-pē-.ȯid adj
1) possessing some properties characteristic of opiate narcotics but not derived from opium
2) of, involving, or induced by an opioid
opioid n
1) any of a group of endogenous neural polypeptides (as an endorphin or enkephalin) that bind esp. to opiate receptors and mimic some of the pharmacological properties of opiates called also opioid peptide
2) a synthetic drug (as methadone) possessing narcotic properties similar to opiates but not derived from opium broadly opiate (1)

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opi·oid (oґpe-oid) 1. any synthetic narcotic that has opiate-like analgesic activity but is not derived from opium. 2. more broadly, any compound with opiate-like activity. Included here are the opiates; synthetic agents not derived from opium; and naturally occurring peptides that bind at or otherwise influence the opiate receptors of cell membranes, including the dynorphins, endorphins, and enkephalins.

Medical dictionary. 2011.

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  • opioid — 1957, from OPIUM (Cf. opium) + OID (Cf. oid) …   Etymology dictionary

  • opioid — [ō′pē oid΄] adj. designating or of a group of natural or synthetic biochemicals, esp. endorphins, that relieve pain in the same way that opiates do n. any such biochemical …   English World dictionary

  • Opioid — Endogenous opioid peptides Skeletal molecular images Adrenorphin Amidorphin Casomorphin …   Wikipedia

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  • opioid — I. adjective Date: 1967 1. possessing some properties characteristic of opiate narcotics but not derived from opium 2. of, involving, or induced by an opioid II. noun Date: 1967 1. any of a group of endogenous neural polypeptides (as an endorphin …   New Collegiate Dictionary

  • opioid — /ˈoʊpiɔɪd/ (say ohpeeoyd) noun 1. an endogenous peptide with pain relieving properties similar to morphine. 2. → opiate (def. 2). –adjective 3. of or relating to such a substance: opioid receptor; opioid analgesic …   Australian-English dictionary

  • opioid — I. ˈōpēˌȯid adjective Etymology: opiate (II) + oid 1. : possessing some properties characteristic of opiate narcotics but not derived from opium 2. : of, involving, or induced by an opioid II. noun …   Useful english dictionary

  • opioid — n. any substance similar to opium; natural substance produced in the body in response to stress or pain; synthetic drug with effects similar to those of opium adj. having characteristics similar to that of opium; caused by an opioid peptide,… …   English contemporary dictionary

  • Opioid receptor — Opioid receptors are a group of G protein coupled receptors with opioids as ligands.[1][2][3] The endogenous opioids are dynorphins, enkephalins, endorphins, endomorphins and nociceptin. The opioid receptors are 40% identical to somatostatin… …   Wikipedia

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