Nouns

(n)oxygen, O, atomic number 8a 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
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(n)O, othe 15th letter of the Roman alphabet
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(n)O, type O, group Othe blood group whose red cells carry neither the A nor B antigens“people with type O blood are universal donors”
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