narcotic

A drug, such as morphine or heroin, that is derived from opium or an opiumlike compound, relieves pain, often induces sleep, can alter consciousness, and is potentially addictive.

A controlled substance.

A soothing, numbing agent or thing.

Inducing sleep or stupor; causing narcosis.

Of or relating to narcotics, their effects, or their use.

Of, relating to, or intended for one addicted to a narcotic.

Having the power to produce stupor.

Consisting in or characterized by stupor: as, narcotic effects.

A substance which directly induces sleep, allaying sensibility and blunting the senses, and which, in large quantities, produces narcotism or complete insensibility.