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Definition of 'o'


  1. 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
       Synonyms: oxygen atomic number 8
  2. the 15th letter of the Roman alphabet
       Synonyms: letter o
  3. the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
       Synonyms: type O group O

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