| opiate | <pharmacology> A remedy containing or derived from opium, also any drug that induces sleep. Naturally occuring basic (alkaloid) molecules with a complex fused ring structure. Have high pharmacological activity. See: morphine. (18 Nov 1997) |
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| opiate receptor | <pharmacology> Opiate-binding sites found throughout primary afferents and the neuraxis. (16 Dec 1997) |
| opiate receptors | Regions of the brain which have the capacity to bind morphine; some, along the aqueduct of Sylvius and in the centre median, are in areas related to pain, but others, as in the striatum, are not related. (05 Mar 2000) |