DRUG
Definition of DRUG
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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."
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A psychoactive substance, especially one which is illegal and addictive, ingested for recreational use, such as cocaine.
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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"
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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."
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To add intoxicating drugs to with the intention of drugging someone.
"She suddenly felt strange. She realized her drink must have been drugged."
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To prescribe or administer drugs or medicines.
Source: Wiktionary