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n 1: the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors" [syn: {type O}, {group O}]
2: 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 [syn: {oxygen}, {atomic number 8}] 3: the 15th letter of the Roman alphabet