Webster's English Dictionary

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narcotic

1. nar.cot.ic \na:r-'ka:t-ik\ n [ME narkotik, fr. MF narcotique, fr. 
   narcotique, adj., fr. ML] narcoticus, fr. Gk narko-tikos, fr. narkoun to 
   benumb, fr. narke- numbness, - more at SNARE 1: a drug (as opium) that in 
   moderate doses dulls the senses, relieves pain , and induces profound sleep 
   but in excessive doses causes stupor, coma, or convulsions 2: something 
   that soothes, relieves, or lulls 
2. narcotic \-i-k(*-)le-\ aj 1a: having the properties of or yielding a 
   narcotic  1b: inducing mental lethargy : SOPORIFEROUS  2: of, induced by, 
   or concerned with narcotics  3: of, involving, or intended for narcotic 
   addicts  - nar.cot.i.cal.ly av