Nouns in english starting with O

• O — Noun – English ～ the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors"
• O — Noun – English ～ 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
• O. Henry — Noun – English ～ United States writer of short stories whose pen name was O. Henry (1862-1910)
• O level — Noun – English ～ the basic level of a subject taken in school
• O — Noun – English ～ the 15th letter of the Roman alphabet
• O'Brien — Noun – English ～ Irish writer (born in 1932)
• O'Casey — Noun – English ～ Irish playwright (1880-1964)
• O'Connor — Noun – English ～ United States writer (1925-1964)
• O'Flaherty — Noun – English ～ Irish writer of short stories (1896-1984)
• o'hara — Noun – English ～ United States writer (1905-1970)
• o'keeffe — Noun – English ～ United States painter (1887-1986)
• O'Neill — Noun – English ～ United States playwright (1888-1953)
• o'toole — Noun – English ～ British actor (born in Ireland in 1932)
• O.E.D. — Noun – English ～ an unabridged dictionary constructed on historical principles
• o.k. — Noun – English ～ an endorsement; "they gave us the O.K. to go ahead"
• oaf — Noun – English ～ an awkward stupid person
• Oahu Island — Noun – English ～ an island of central Hawaii (between Molokai and Kauai); the chief island of the state
• oahu — Noun – English ～ an island of central Hawaii (between Molokai and Kauai); the chief island of the state
• oak apple — Noun – English ～ oak gall caused by larvae of a cynipid wasp
• oak chestnut — Noun – English ～ a tree of the genus Castanopsis

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