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O (1)

O [ ō ] (plural O's or Os)


noun 
Definition:
 
1. 'O'-shaped object: something shaped like a letter 'O'

2. zero: the number zero

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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