All articles starting with O

Os Barões da Pisadinha

Os Barões da Pisadinha, also known as Barões da Pisadinha, are a Brazilian pisadinha duo formed in 2015 in Heliópolis, Bahia, credited as precursors of the genre.

Os Donos do Jogo is a 2025 Netflix Brazilian fictional crime drama (8 episodes, 29 October 2025) by Heitor Dhalia and Paranoïd Filmes about four families fighting over the jogo do bicho in Rio de Janeiro; renewed for a second season.

Os Escravos

Os Escravos is a posthumous 1883 collection of 34 antislavery poems by the Brazilian poet Castro Alves, including O Navio Negreiro and Vozes d'África.

Oct 3, 2026

Os Farofeiros

Os Farofeiros is a 2018 Brazilian comedy directed by Roberto Santucci, in which four coworkers and their families arrive at a dilapidated beach house far from the promised destination.

Os Garotin

Os Garotin is a Brazilian trio from São Gonçalo, Rio de Janeiro, blending samba with soul and R&B; its 2024 debut album won a Latin Grammy.

Os Incríveis

Os Incríveis is a Brazilian band formed in 1962 as The Clevers, among the most successful acts in Brazilian rock of the 1960s and early 1970s.

Os Lusíadas

Os Lusíadas (The Lusiads), Luís de Camões's 1572 Portuguese epic in 10 cantos and 1,102 ottava-rima stanzas, celebrates Vasco da Gama's sea voyage to India and Portugal's history, emulating Virgil's Aeneid.

Os Mutantes

Os Mutantes are a Brazilian psychedelic rock band formed in São Paulo in 1966 by Rita Lee, Arnaldo Baptista, and Sérgio Dias, founders of Tropicalismo.

Os Sapos

Os Sapos, "The Frogs", is a satirical poem by Brazilian poet Manuel Bandeira, written in 1918 and published in his 1919 book Carnaval; it mocks Parnassianism.

Os Sertões

Os Sertões, translated as Rebellion in the Backlands, is a 1902 nonfiction book by Brazilian writer Euclides da Cunha recounting the army's destruction of the Canudos settlement in 1897.

Os Timbiras

Os Timbiras is an unfinished epic poem by the Brazilian Romantic poet Antônio Gonçalves Dias, published in Leipzig in 1857; only its first four cantos appeared in print.

Os Valvulados

Os Valvulados are a Brazilian soul and black-music group from Garanhuns, Pernambuco, formed around 2005 and known for reinterpreting classics of Brazilian popular music, especially 1970s samba-funk.

OS X El Capitan

OS X El Capitan (version 10.11), also known as OS X 10.11, is the twelfth major release of Apple's OS X desktop operating system, released on September 30, 2015.

OS X Mavericks

OS X Mavericks (version 10.9) is the tenth major release of Apple's Mac operating system, released as a free download on October 22, 2013, with over 200 new features.

OS X Mountain Lion

OS X Mountain Lion (version 10.8) is the ninth major release of Apple's Mac operating system, released in July 2012 with more than 200 new features, mostly ported from iOS.

OS X Yosemite

OS X Yosemite, version 10.10, is the eleventh major release of Apple's Mac operating system, released free on October 16, 2014 with a redesigned interface and Continuity features linking Macs with iPhones and iPads.

OS-9

OS-9 is a real-time, multiuser, multitasking operating system developed by Microware for the Motorola 6809 in 1980, later ported to the 68000 and rewritten in C as OS-9000.

Oct 21, 2026

OS-RC-2

OS-RC-2 (OSRC2, RC-2, CVCL_1626) is a human clear cell renal cell carcinoma cell line established in 1985 from a 52-year-old Japanese male; VHL-null, 3p-deleted, ccB subtype, sorafenib-resistant, used in RCC drug-resistance and metastasis research.

OS/2

OS/2, also known as IBM OS/2, is a discontinued PC operating system first announced by IBM and Microsoft in 1987 and later developed solely by IBM.

Oct 15, 2026

Osa Demolition Equipment

Osa Demolition Equipment is an Italian manufacturer of demolition attachments for excavators, including hydraulic hammers, crushers, pulverizers, shears, and sorting grapples, founded by the Sallustio brothers in Molfetta and acquired by Sandvik in 2025.

Oct 20, 2026

Osa Peninsula

Osa Peninsula, southwestern Costa Rica Pacific peninsula (~1,500 km2) harboring 2.5% of global terrestrial biodiversity, Corcovado National Park, the Osa Mélange, and Cocos Ridge subduction uplift.

osage

osage is a four-piece Japanese rock band formed in Shimokitazawa, Tokyo, active since 2017, which made its major debut on Sony Music Labels in August 2024 after appearing at JAPAN JAM.

Osage County, Oklahoma

Osage County, Oklahoma: the state's largest county by area (2,303.8 sq mi), county seat Pawhuska, contiguous with the Osage Nation Reservation, created at 1907 statehood, known for Osage oil-boom history and the Tallgrass Prairie Preserve.

Osage Indian murders

The Osage Indian murders, or Reign of Terror, were early-1920s killings of oil-wealthy Osage Nation members in Oklahoma for their headrights, culminating in William K. Hale's 1929 conviction in the FBI-forming federal investigation.

Osage language

Osage (Wahzhazhe, 𐓏𐓘𐓻𐓘𐓻𐓟) is a Dhegiha Siouan language of Oklahoma, related to Kansa, Omaha-Ponca, and Quapaw, written in a 2006 Osage script and undergoing Osage Nation revitalization after native speaker loss.