O

English Dictionary -> Letter O -> O

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O Definition

• (n) the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
• (n) 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
• (n) the 15th letter of the Roman alphabet

O Synonyms

• atomic number 8
• group O
• O
• oxygen
• type O