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noun()the blood group whose red cells carry neither the A nor B antigens
Synonyms: group o, type o,
Examples:
People with type O blood are universal donors.
o
noun()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: atomic number 8, oxygen,
o
noun()the 15th letter of the Roman alphabet