All articles starting with O
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Ostrov Solsberi
Ostrov Solsberi (Остров Солсбери), also called Salisbury Island, is a largely glaciated island in central Franz Josef Land, Russia, the largest of the Zichy Land group.
Ostrov Vaygach
Ostrov Vaygach (Остров Вайгач, Vaygach Island), Nenets 'Holy Land' (Khebidya-Ya), an Arctic island between the Barents and Kara seas in Nenets Autonomous Okrug; 3,383-3,400 km2, sacred Nenets sites, 1930s OGPU lead-zinc mining, zakaznik since 2007.
Ostrov Zemlya Aleksandry
Ostrov Zemlya Aleksandry (Alexandra Land, Земля Александры) is the westernmost large island of Franz Josef Land, Russia, in the Barents Sea; about 1,000 km², mostly ice-covered, site of Nagurskoye airbase and the Arctic Trefoil military base.
Ostrovany
Ostrovany (Osztópataka, Ósztrópataka) is a village in Sabinov District, eastern Slovakia, on the Torysa river, known for Germanic princely graves found in 1790 and 1865, dated 270–290 AD, and a 1248 first written record.
Ostrowski's theorem
Ostrowski's theorem is a 1916 result in number theory stating that every nontrivial absolute value on the rational numbers is equivalent to the usual real one or a p-adic one.
Ostry
Ostry (Ostraya, Ostriy), GVP 300680, is a dormant 2,552 m stratovolcano in the northern Sredinny Range, central Kamchatka, Russia; last eruption about 2050 BCE from flank Cone X; distinct from Ostry Tolbachik.
Ostwald (lunar crater)
Ostwald is an IAU-approved impact crater on the far side of the Moon, 108.13 km in diameter, centered at 10.24°N, 121.95°E, large enough to have a complex, flat-floored form.
Ostwald process
The Ostwald process is the industrial chemical process that converts ammonia into nitric acid by catalytic oxidation, remaining the main route to fertilizer precursor nitric acid.
Ostwald ripening
Ostwald ripening is the dissolution of small crystals or sol particles and redeposition on larger ones, a coarsening process first described by Wilhelm Ostwald in 1901.
Ostwald ripening and coalescence degradation in PEM fuel cell catalysts
Ostwald ripening and coalescence degradation are the two sintering pathways by which platinum nanoparticles in PEM fuel cell catalyst layers grow during operation, cutting active surface area.
OSU-35K
OSU-35K (Okrętowy System Uzbrojenia) is a Polish remotely controlled naval weapon system with a 35 mm cannon, made by PIT-RADWAR for the Polish Navy's Kormoran II minehunters.
Osu!
Osu! is a free-to-win, open-source rhythm game by peppy, publicly released September 17, 2007, with four game modes (osu!, taiko, catch, mania), community beatmaps, and pp-based global ranking.
Osuga Valles
Osuga Valles, a 164-km-long Martian outflow channel near Eos Chaos south of Valles Marineris, carved by catastrophic floods up to 10^7 m3/s, with terminal cavi possibly formed by subsurface salt dissolution.
Ōsugi Sakae
Ōsugi Sakae (大杉栄) was a Japanese anarchist, editor, and translator who led the Taishō-era anarchist movement until his murder by military police after the 1923 Great Kantō Earthquake.
Ōsumi Islands
Ōsumi Islands (大隅諸島), also called Osumi-shoto, are Kagoshima Prefecture islands south of Kyushu: Yakushima (World Heritage cedar forests), Tanegashima (space center, surfing), and the three small Mishima-mura islands.
Osun State
Osun State, southwestern Nigerian state created 27 August 1991 from Oyo State, capital Osogbo, 30 local government areas, Yoruba cultural heartland with Ile-Ife and the UNESCO-listed Osun-Osogbo Sacred Grove; Governor Ademola Adeleke re-elected in 2026 under Accord.
Osun-Osogbo Sacred Grove
The Osun-Osogbo Sacred Grove is a 75-hectare forest sanctuary in Osogbo, Nigeria, home of the Yoruba fertility goddess Osun and a UNESCO World Heritage Site since 2005.
Osvald Moberg
Osvald Moberg (Karl Osvald Moberg, Moppe, 1888-1933), Swedish artistic gymnast with Stockholms GF; won 1908 London Olympic gold in the men's team event, Sweden first of eight teams with 438 points.
Osvaldo A. Bascur
Osvaldo A. Bascur is a Chilean-born mineral-processing engineer who created the Dynafloat and Dynamill simulation models and, at OSIsoft, a sensor-to-enterprise blueprint for mining operations.
Osvaldo Alfredo Reig
Osvaldo Alfredo Reig (1929–1992) was an Argentine mammalogist, paleontologist, and evolutionary biologist who described the dinosaur Herrerasaurus and theorized how South America's rodent fauna arrived.
Osvaldo Ardiles
Osvaldo César "Ossie" Ardiles, Argentine midfielder born 1952 in Córdoba, 1978 World Cup winner and Tottenham Hotspur legend (1978-88), later manager of Spurs 1993-94 and clubs worldwide.
Osvaldo Benavides
Osvaldo Benavides (born 1979, Mexico City) is a Mexican actor, producer, and director; child star as Nandito in Maria la del barrio, later La suerte de Loli, The Good Doctor, Monarca, and the 2024 film Noche de bodas.
Osvaldo Dorticós Torrado
Osvaldo Dorticós Torrado (1919-1983) was a Cuban lawyer, minister of Revolutionary Laws, and president of Cuba from July 1959 to December 1976, when the 1976 constitution made Fidel Castro head of state; Dorticós later served as economy and justice minister and died by suicide in 1983.
Osvaldo Fernandez
Osvaldo Fernandez, born Osvaldo Fernández Rodríguez in 1966 in Holguín, Cuba, is a Cuban former pitcher who won 1992 Olympic gold and pitched in MLB.
Osvaldo Lamborghini
Osvaldo Lamborghini (1940–1985) was an Argentine writer and visual artist whose corrosive, politically charged fiction, including El fiord, shaped the Argentine literary canon of the 1970s and 1980s.
Osvaldo Ribó
Osvaldo Ribó (Andrés Bartolomé Osuna, 1927–2015), Argentine tango singer with Ricardo Tanturi's orchestra; his signature recording was "Papel picado" (1948), and he was the father of actress Olivia Hussey.
Osvaldo Soriano
Osvaldo Soriano (1943–1997) was an Argentine novelist and journalist who wrote in exile after the 1976 military coup, best known for No habrá más penas ni olvido.
OSVAT Oil Pipeline
The OSVAT (Oleoduto São Sebastião–Guararema) is an 83 km crude oil pipeline in São Paulo state, Brazil, owned by Petrobras and operated by Transpetro, carrying crude from the coastal São Sebastião terminal inland to refineries.
OSVAT-34 Oil Pipeline
The OSVAT-34 Oil Pipeline is a 35 km Petrobras crude oil pipeline in São Paulo state, Brazil, running from Guararema Terminal to the Revap refinery since 1979.
Oswal
The Oswal is a Jain merchant and banking community from Osiya in Marwar, Rajasthan, traditionally founded when Ratnaprabha Suri converted a Rajput king and his followers to Jainism.