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drug

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A drug is a medication or an addictive substance. (noun)

An example of a drug is an antibiotic.
An example of a drug is marijuana.

To drug means to give someone medication or to poison with an addictive and dangerous substance. (verb)

An example of to drug is for a doctor to give Novocaine.
An example of to drug is to put cocaine into someones drink.

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See drug in Webster's New World College Dictionary

noun

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
Obsolete any substance used in chemistry, dyeing, etc.
a narcotic, hallucinogen, etc., esp. one that is habit-forming

transitive verb drugged, drugging

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

See drug in American Heritage Dictionary 4

(drŭg)

noun

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 U.S. Food, Drug, and Cosmetic Act.
A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
Obsolete A chemical or dye.

transitive verb drugged drugged, drug·ging, Drugs drugs

To administer a drug to.
To poison or mix (food or drink) with a drug.
To stupefy or dull with or as if with a drug: drugged with sleep.

Learn more about drug

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drug (synonyms)

DRUG (abbreviation)