CO

/kou/
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Definition
  1. Noun:
    • A state in the west central United States in the Rocky Mountains: An abbreviation for the state of Colorado.
    • One who refuses to serve in the armed forces on grounds of conscience: A conscientious objector.
    • A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition: The chemical symbol for the element cobalt (Co).
    • An odorless very poisonous gas that is a product of incomplete combustion of carbon: The chemical formula for carbon monoxide (CO).
Usage Examples
  • Noun (State):
    • I went skiing in CO last winter.
  • Noun (Conscientious Objector):
    • During the war, he registered as a CO.
  • Noun (Chemical Element):
    • Cobalt (Co) is used in making strong alloys.
  • Noun (Gas):
    • The alarm detected dangerous levels of CO in the house.
Advanced Usage
  • "CO" as an abbreviation in addresses: Used in postal addresses to represent the state of Colorado.
    • Denver, CO 80202
  • "CO" in medical/technical contexts: Refers to carbon monoxide poisoning.
    • The patient was treated for CO inhalation.
Variants and Related Words
  • Colorado: The full name of the state abbreviated as CO.
  • Cobalt: The full name of the metallic element Co.
  • Carbon monoxide: The full name of the poisonous gas CO.
  • Company (Co.): A common abbreviation in business names (e.g., & Co.). Note: This is a distinct abbreviation, often written with a period (Co.).
Synonyms
  • For the state: Colorado.
  • For the person: Conscientious objector.
  • For the element: Cobalt (symbol Co).
  • For the gas: Carbon monoxide.
Related Phrases
  • CO detector: A device that alerts to the presence of carbon monoxide gas.
    • Every home should have a working CO detector.
  • CO poisoning: Illness caused by inhaling carbon monoxide.
    • Symptoms of CO poisoning include headache and dizziness.
Noun
  1. a state in west central United States in the Rocky Mountains
  2. one who refuses to serve in the armed forces on grounds of conscience
  3. a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
  4. an odorless very poisonous gas that is a product of incomplete combustion of carbon

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