O (Noun)
Meaning 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.
Classification
Nouns denoting substances.
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Hypernyms
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Meaning 2
The 15th letter of the Roman alphabet.
Classification
Nouns denoting communicative processes and contents.
Synonyms
Hypernyms
Meaning 3
The blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors".
Classification
Nouns denoting body parts.