Definition of: narcotic

(när·kot′ik) noun
1. Any of various substances, as opium, morphine, and codeine, that in medicinal doses relieve pain, induce sleep, and in excessive or uncontrolled doses may produce convulsions, coma, and death.
2. An individual addicted to the use of narcotics.
—adjective
1. Having the quality of causing narcosis or stupor.
2. Figuratively, causing sleep or dulness, as a book or sermon. Also nar·cose (när′kōs), nar·cot′i·cal adjective [<Gk. narkōtikos <narkē torpor]
—nar·cot′i·cal·ly adverb