Definition - O

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O
  1. the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
  2. the 15th letter of the Roman alphabet
  3. the 15th letter of the Roman alphabet
  4. 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