A substance that affects the central nervous system and is often addictive

• drug

  1. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
  2. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
  3. Such a substance as recognized or defined by the US Food, Drug, and Cosmetic Act.

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  1. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
  2. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
  3. Such a substance as recognized or defined by the US Food, Drug, and Cosmetic Act.

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• narcotic

  1. A controlled substance.
  2. A drug, such as morphine or heroin, that is derived from opium or an opiumlike compound, relieves pain, often induces sleep, can alter consciousness, and is potentially addictive.
  3. (--- loosely) Any illicit drug, as LSD or marijuana

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  1. A controlled substance.
  2. A drug, such as morphine or heroin, that is derived from opium or an opiumlike compound, relieves pain, often induces sleep, can alter consciousness, and is potentially addictive.
  3. (--- loosely) Any illicit drug, as LSD or marijuana

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• opiate

  1. Any of various analgesic, narcotic drugs derived from the opium poppy, such as morphine or codeine.
  2. A drug, hormone, or other chemical substance having sedative or narcotic effects similar to those containing opium or its derivatives:
  3. Any drug containing opium or any of its derivatives, and acting as a sedative and narcotic

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  1. Any of various analgesic, narcotic drugs derived from the opium poppy, such as morphine or codeine.
  2. A drug, hormone, or other chemical substance having sedative or narcotic effects similar to those containing opium or its derivatives:
  3. Any drug containing opium or any of its derivatives, and acting as a sedative and narcotic

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• dope

  1. A drug used to stimulate or hinder a racehorse's performance
  2. An illicit drug, especially marijuana.
  3. (Informal) Any drug or narcotic, or such drugs collectively

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  1. A drug used to stimulate or hinder a racehorse's performance
  2. An illicit drug, especially marijuana.
  3. (Informal) Any drug or narcotic, or such drugs collectively

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