o·pi·oid (  p -oid )n. See opiate. adj. Opiate. |
opioid [ˈəʊpɪˌɔɪd]
n
(Life Sciences & Allied Applications / Physiology)
a. any of a group of substances that resemble morphine in their physiological or pharmacological effects, esp in their pain-relieving properties
b. (modifier) of or relating to such substances opioid receptor opioid analgesic
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