o
1. 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
synset: oxygen, O, atomic_number_8
2. the 15th letter of the Roman alphabet
synset: O, o
3. the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
Princeton University "About WordNet." WordNet. Princeton University. 2010.
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