drug

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
2. n. Such a substance as recognized or defined by the U.S. Food, Drug, and Cosmetic Act.
3. n. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
4. n. Obsolete A chemical or dye.
5. v. To administer a drug to.
6. v. To poison or mix (food or drink) with a drug.
7. v. To stupefy or dull with or as if with a drug: drugged with sleep.

Century Dictionary and Cyclopedia

1. n. Any vegetable, animal, or mineral substance used in the composition or preparation of medicines; hence, also, any ingredient used in chemical preparations employed in the arts.
2. n. A thing which has lost its value, and is no longer wanted; specifically, a commodity that is not salable, especially from overproduction: as, a drug in the market (the phrase in which the word is generally used).
3. To mix with drugs; narcotize or make poisonous, as a beverage, by mixture with a drug: as, to drug wine (in order to render the person who drinks it insensible).
4. To dose to excess with drugs or medicines.
5. To administer narcotics or poisons to; render insensible with or as with a narcotic or anesthetic drug; deaden: as, he was drugged and then robbed.
6. To surfeit; disgust.
7. To prescribe or administer drugs or medicines, especially to excess.
8. n. A drudge.
9. n. Same as drogue.

Wiktionary

1. n. A substance used to treat an illness, relieve a symptom, or modify a chemical process in the body for a specific purpose.
2. n. A substance, often addictive, which affects the central nervous system.
3. n. A chemical or substance, not necessarily for medical purposes, which alters the way the mind or body works.
4. n. A substance, especially one which is illegal, ingested for recreational use.
5. v. To administer intoxicating drugs to, generally without the recipient's knowledge or consent.
6. v. To add intoxicating drugs to with the intention of drugging someone.
7. v. simple past tense and past participle of drag.

GNU Webster's 1913

1. v. To drudge; to toil laboriously.
2. n. A drudge (?).
3. n. Any animal, vegetable, or mineral substance used in the composition of medicines.
4. n. Any commodity that lies on hand, or is not salable; an article of slow sale, or in no demand; -- used often in the phrase “a drug on the market”.
5. n. any stuff used in dyeing or in chemical operations.
6. n. any substance intended for use in the treatment, prevention, diagnosis, or cure of disease, especially one listed in the official pharmacopoeia published by a national authority.
7. n. any substance having psychological effects, such as a narcotic, stimulant, or hallucinogenic agent, especially habit-forming and addictive substances, sold or used illegally
8. v. To prescribe or administer drugs or medicines.
9. v. To affect or season with drugs or ingredients; esp., to stupefy by a narcotic drug. Also Fig.
10. v. To tincture with something offensive or injurious.
11. v. To dose to excess with, or as with, drugs.

WordNet 3.0

1. v. use recreational drugs
2. n. a substance that is used as a medicine or narcotic
3. v. administer a drug to