a class of drugs (e.g., heroin, codeine, methadone) that are derived from the opium poppy plant, contain opium, or are produced synthetically and have opium-like effects. Opioid drugs relieve pain, dull the senses and induce sleep.
OPIOID
Meaning of OPIOID in English
AIDS English Glossary. Английский словарь СПИДа. 2012