2. (foll by with) to associate (oneself) or be associated, esp as a subordinate or subsidiary; bring or come into close connection: he affiliated himself with the Union. b. (as modifier): an affiliate member.
Opiate is a term classically used in pharmacology to mean a drug derived from opium. Opioid, a more modern term, is used to designate all substances, both natural and synthetic, that bind to opioid receptors (including antagonists}. Opiates are alkaloid compounds naturally found in the opium poppy plant Papaver somniferum.
1. any synthetic narcotic that has opiate-like activities but is not derived from opium. 2. any of a group of naturally occurring peptides, e.g., enkephalins, that bind at or otherwise influence opiate receptors, either with opiate-like or opiate antagonist effects.. any synthetic narcotic that has opiate-like activities but is not derived from opium. 2. denoting naturally occurring peptides, e.g. enkephalins, that exert opiate-like effects by interacting with opiate receptors of cell membranes.