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Definitions of O:
  • noun:   the 15th letter of the Roman alphabet
  • noun:   the blood group whose red cells carry neither the A nor B antigens
    Example: "People with type O blood are universal donors"
  • noun:   a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

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Search for O at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See O used in context: 22 poetry verses, 1 Shakespeare work

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