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
Webster's English Dictionary