Definition

/dɹʌɡ/

noun

A substance used to treat an illness, relieve a symptom, or modify a chemical process in the body for a specific purpose.
“Aspirin is a drug that reduces pain, acts against inflammation and lowers body temperature.”
A psychoactive substance, especially one which is illegal and addictive, ingested for recreational use, such as cocaine.
Anything, such as a substance, emotion or action, to which one is addicted.
“2010, Kesha Rose Sebert (Ke$ha), with Pebe Sebert and Joshua Coleman (Ammo), Your Love is My Drug”
Any commodity that lies on hand, or is not salable; an article of slow sale, or in no demand.

verb

To administer intoxicating drugs to, generally without the recipient's knowledge or consent.
“She suddenly felt strange, and only then realized she'd been drugged.”
To add intoxicating drugs to with the intention of drugging someone.
“She suddenly felt strange. She realized her drink must have been drugged.”
To prescribe or administer drugs or medicines.