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O1 US English

The fifteenth letter of the alphabet

O2 US English


O3 US English

archaic spelling of oh.

O' US English

In Irish patronymic names such as O’Neill

oxygen US English

A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Oxygen forms about 20 percent of the earth’s atmosphere, and is the most abundant element in the earth’s crust, mainly in the form of oxides, silicates, and carbonates

O in oxygen US English

A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Oxygen forms about 20 percent of the earth’s atmosphere, and is the most abundant element in the earth’s crust, mainly in the form of oxides, silicates, and carbonates

o US English


o' US English

Short for of, used to represent an informal pronunciation.

o- US English


-o US English

Forming chiefly informal or slang variants or derivatives such as righto, wino

-o- US English

Used as the terminal vowel of combining forms

o in O1 US English

The fifteenth letter of the alphabet

oh in O1 US English

Zero (in a sequence of numerals, especially when spoken)

o-o US English

A honeyeater (bird) found in Hawaii, now probably extinct, which had a thin curved bill and climbed about on tree trunks

c/o US English

Care of

I/O US English


o/a US English

On or about

O & M US English

Operations and maintenance

o/c US English


P & O US English

Peninsular and Oriental Steam Navigation Company

w/o US English


o'er US English

Archaic or poetic/literary contraction for over.

O-Bon US English

Another name for Bon.

O-ring US English

A gasket in the form of a ring with a circular cross section, typically made of pliable material, used to seal connections in pipes, tubes, etc.

billy-o US English

Very much, hard, or strongly

o'clock US English

Used to specify the hour in telling time

O level US English

(In the UK except Scotland) the lower of the two main levels of standardized examinations in secondary schools

Henry, O. US English

(1862–1910), US short-story writer; pseudonym of William Sydney Porter. Jailed for embezzlement in 1898, he started writing in prison. His humorous, ironic stories of everyday life depend on coincidence and twists. Collections of his works include Cabbages and Kings (1904), The Voice of the City (1908), and Waifs and Strays (published posthumously in 1917)

O'Fallon US English

A city in eastern Missouri, northwest of St. Louis; population 76,819 (est. 2008)

four-o'clock US English

A tropical American herbaceous plant with fragrant trumpet-shaped flowers that open late in the afternoon

O'Hara, John US English

(1905–70), US writer; full name John Henry O’Hara. He wrote Butterfield 8 (1935), Pal Joey (1940), Ten North Frederick (1955), and Waiting for Winter (1966)

John o'Groats US English

A village at the extreme NE point of the Scottish mainland

O'Brien, Edna US English

(1932-), Irish novelist and short-story writer. Her works include the novels The Country Girls (1960) and In the Forest (2002), the collection A Fanatic Heart: Selected Stories (1984), and the biography Byron in Love (2009)

O'Brien, Flann US English

(1911–66), Irish novelist and journalist; pseudonym of Brian O’Nolan. Writing under the name Myles na Gopaleen, he contributed a satirical column to the Irish Times for nearly twenty years. Notable novels: At Swim-Two-Birds (1939); The Third Policeman (1967)

O'Casey, Sean US English

(1880–1964), Irish playwright. His plays, such as The Shadow of a Gunman (1923) and Juno and the Paycock (1924), deal with the Irish poor before and during the civil war that followed the establishment of the Irish Free State in 1922

O'Hara, Frank US English

(1926–66), US poet and art critic; full name Francis Russell O’Hara. His poetry reflects his close ties to the art world in New York City and is collected in volumes such as A City in Winter (1952), Meditations in an Emergency (1956), and Lunch Poems (1964)

O'Toole, Peter US English

(1932–2013), British actor, born in Ireland; full name Peter Seamus O’Toole. He is noted for his portrayals of eccentric characters. Notable movies: Lawrence of Arabia (1962), Becket (1964), Lion in Winter (1968), Goodbye, Mr. Chips (1969), and The Last Emperor (1987). He received an honorary Academy Award in 2003

Simpson, O. J. US English

(1947-), US football player and actor; full name Orenthal James Simpson. Following a successful career as a running back for the Buffalo Bills 1969–77 and the San Francisco 49ers 1978–79, he became a television sports commentator. He was arrested in 1994, accused of murdering his ex-wife Nicole Brown Simpson (1959–94) and Ronald Goldman (1968–94). He was acquitted after a lengthy, high-profile trial, but in a 1997 civil court, he was found liable for both wrongful deaths. In 2008 he was sentenced to at least 9 years in prison on separate charges of assault and kidnapping

tam-o'-shanter US English

A round woolen or cloth cap of Scottish origin, with a pom-pom in the center

jack-o'-lantern US English

A lantern made from a hollowed-out pumpkin in which holes are cut to represent facial features, typically made at Halloween

O'Connell, Daniel US English

(1775–1847), Irish nationalist leader and social reformer; known as the Liberator. His election to Parliament in 1828 forced the British government to grant emancipation to Catholics in order to enable him to take his seat in the House of Commons

O'Connor, Carroll US English

(1924–2001), US actor, writer, and producer. He starred as Archie Bunker in the television series All in the Family (1971–79) and Archie Bunker’s Place (1979–83). He also starred in the series In the Heat of the Night (1988–95)

O'Connor, Flannery US English

(1925–64), US novelist and short-story writer; full name Mary Flannery O’Connor. Her short stories are notable for their dark humor and grotesque characters and are published in collections such as A Good Man Is Hard to Find, and Other Stories (1955). Notable novels: Wise Blood (1952) and The Violent Bear It Away (1960)

O'Donnell, Rosie US English

(1962-), US comedienne, actress, and talk show host; full name Roseann O’Donnell. On television, she hosted The Rosie O’Donnell Show (1996–2002) and cohosted The View (2006–07). Her acting credits include the revival of the Broadway musical Grease (1994) and the movies A League of Their Own (1992) and Harriet the Spy (1996)

O'Keeffe, Georgia US English

(1887–1986), US painter. A pioneer of modernism in America, she first produced largely abstract work, adopting a more figurative style in the 1920s. Her best-known paintings depict enlarged studies, particularly of flowers, and are often regarded as being sexually symbolic. She married photographer Alfred Stieglitz in 1924

O'Neal, Shaquille US English

(1972-), US basketball player. During his career as a center since 1992, he has played for the Orlando Magic, Los Angeles Lakers, Miami Heat, Phoenix Suns, and Cleveland Cavaliers

O'Neill, Eugene US English

(1888–1953), US playwright; full name Eugene Gladstone O’Neill. He was awarded the Pulitzer Prize for his first full-length play, Beyond the Horizon (1920). Other notable works: The Iceman Cometh (1946) and Long Day’s Journey into Night(1956, posthumously). Nobel Prize for Literature (1936)

Selznick, David O. US English

(1902–65), US movie producer; full name David Oliver Selznick. He made King Kong (1933) for RKO and Anna Karenina (1935) for MGM before establishing his own production company in 1936, where he produced such screen classics as Gone with the Wind (1939) and Rebecca (1940)

will-o'-the-wisp US English

A phosphorescent light seen hovering or floating at night over marshy ground, thought to result from the combustion of natural gases; ignis fatuus

input-output US English

Of, relating to, or for both input and output

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