Webster's English Dictionary

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drug

1. drug \'dr*g\ n [ME drogge] obs  1a: a substance used in dyeing or 
   chemical operations  1b: a substance used as a medicine or in making 
   medicines  2: something little sought after {a ~ on the market}  3: a 
   narcotic substance or preparation 
2. drug vb or drugged;  or drug.ging 1: to affect with a drug; esp : to 
   stupefy by a narcotic drug  2: to administer a drug to  3: to lull or 
   stupefy as if with a drug  : to take drugs for narcotic effect