narcotic

Etymology 1

From Middle English narcotyk, from Middle French narcotique (from Old French narcotique, noun use of adjective) and directly from Medieval Latin narcōticum, from Ancient Greek ναρκωτῐκόν (narkōtikón), neuter of ναρκωτῐκός (narkōtikós), from Ancient Greek ναρκόω (narkóō, “to benumb”), from νάρκη (nárkē, “numbness, torpor”).

noun

1. (pharmacology) 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.
2. Any type of numbing or soothing drug.

Etymology 2

From Middle French narcotique or German narkotisch and directly from Medieval Latin narcōticus, from Ancient Greek ναρκωτῐκός (narkōtikós).

adj

1. Of, or relating to narcotics.
2. (pharmacology) Inducing sleep; causing narcosis.