Definition of "o" [o]

  • 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)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • Any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form (noun)

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