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Narcotic, drug that induces sleep; specifically, the analgesics (painkilling drugs) opium, codeine, morphine, and heroin. These affect the higher brain centers, numbing the senses, lessening pain, causing mild euphoria and sleep (narcosis). They may act as hallucinogenic drugs and are addictive.

See also: Drug abuse.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Mudpuppy to Nebula