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WordNet-Online
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Noun o has 3 senses
- O, type O, group O - the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
--1 is a kind of blood group, blood type
- 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
--2 is a kind of chemical element, element; gas
--2 is a substance of water, H2O; air; ozone
--2 has particulars: liquid oxygen, LOX
- O - the 15th letter of the Roman alphabet
--3 is a kind of letter, letter of the alphabet, alphabetic character
--3 is a member of Roman alphabet, Latin alphabet
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