English dictionary



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English noun: O

1. O (substance) 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


Synonymsatomic number 8, oxygen


Broader (hypernym)chemical element, element, gas


Narrower (hyponym)liquid oxygen, LOX


Substance meronymair, H2O, ozone, water

2. O (communication) the 15th letter of the Roman alphabet


Broader (hypernym)alphabetic character, letter, letter of the alphabet


Member meronymLatin alphabet, Roman alphabet

3. O (body) the blood group whose red cells carry neither the A nor B antigens


SamplesPeople with type O blood are universal donors.


Synonymsgroup O, type O


Broader (hypernym)blood group, blood type









Based on WordNet 3.0 copyright © Princeton University.
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