narcotic UK /nɑːˈkɒtɪk/US /nɑɹˈkɑtɪk/adjective 2noun 2forms 3 adjective2 •Inducing sleep; causing narcosis.The duration of a prescription may give clues into how long a person ends up using a narcotic painkiller, a new study finds. — 2017 •Of, or relating to narcotics. noun2 •Any substance or drug that reduces pain, induces sleep and may alter mood or behaviour; in some contexts, especially in reference to the opiates-and-opioids class, especially in reference to illegal drugs, and often both."Real San Juan Colorado," he said. "Excitable people like you are the better for narcotics. Heavens! don't bite it! Cut - and cut with reverence!" — 1912 •Any type of numbing or soothing drug.But, for the unquiet heart and brain, A use in measured language lies; The sad mechanic exercise, Like dull narcotics, numbing pain. — 1850 formsnarcotics · more narcotic · most narcotic