noun

1. any substance used as a medicine or as an ingredient in a medicine which kills or inactivates germs, or affects any body function or organ
2. Obsolete any substance used in chemistry, dyeing, etc.
3. a narcotic, hallucinogen, etc., esp. one that is habit-forming

Etymology: ME drogge < OFr drogue < ? LowG drooge (fat), dry (cask), the adj. mistaken as the name of the contents: see dry

transitive verb drugged, drugging drug′·ging

1. to put a harmful drug in (a food, drink, etc.)
2. to administer a drug to
3. to stupefy with or as with a drug