Definition For Drug:

1. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
Such a substance as recognized or defined by the U.S. 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.

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