Definition of "o" [o]

  • (noun) The 15th letter of the modern English alphabet.
  • (noun) Any of the speech sounds represented by the letter o.
  • (noun) The 15th in a series.
  • (noun) Something shaped like the letter O.
  • (noun) One of the four major blood groups in the ABO system. Individuals with this blood group have neither A nor B antigens on the surface of their red blood cells, and have both anti-A and anti-B antibodies in their blood serum.
  • (noun) the 15th letter and fourth vowel of the modern English alphabet
  • (noun) any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form

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