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narcotic

noun

  1. a drug, as opium or any of its derivatives (morphine, heroin, codeine, etc.), used to relieve pain and induce sleep: narcotics are often addictive and in excessive doses can cause stupor, coma, or death
  2. anything that has a soothing, lulling, or dulling effect

adjective

  1. of, like, or capable of producing narcosis
  2. of, by, or for narcotic addicts

See narcotic in American Heritage Dictionary 4

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