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O — СИНОНІМІЯ

o the blood group whose red cells carry neither the A nor B antigens

group o
type o
WordNet

o 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

atomic number 8
oxygen
WordNet
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