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| O [ ō ] (plural O's or Os) |
noun |
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| Definition: |
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1. "O"-shaped object: something shaped like a letter "O"
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2. zero: the number zero
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3. medicine human blood type: a human blood type of the ABO system containing the O antigen. Somebody with this type of blood can donate to all other types in the group but can receive only type O blood.
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