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a. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
b. Such a substance as recognized or defined by the US Food, Drug, and Cosmetic Act.
2. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
3. Obsolete A chemical or dye.
tr.v. drugged, drug·ging, drugs
a. To administer a drug to, especially to treat pain or induce anesthesia.
b. To give a drug to, especially surreptitiously, in order to induce stupor.
2. To poison or mix (food or drink) with a drug.
[Middle English drogge, from Old French drogue, drug, perhaps from Middle Dutch droge (vate), dry (cases), pl. of drog, dry.]