1. (noun) oxygen, O, atomic number 8
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: type O, oxygen, group O, atomic number 8
2. (noun) O, o
the 15th letter of the Roman alphabet
Synonyms: type O, oxygen, group O, atomic number 8
3. (noun) O, type O, group O
the blood group whose red cells carry neither the A nor B antigens
Synonyms: type O, oxygen, group O, atomic number 8
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Synonyms and Antonyms of O 
