O
Explore definitions, synonyms, and language insights of O
Definitions
Noun
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
Noun
the 15th letter of the Roman alphabet
Noun
the 15th letter of the Roman alphabet
Noun
the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
More General Terms
alphabetic character
blood group
blood type
chemical element
element
gas
letter
letter of the alphabet