All articles starting with O

OranjeWind

OranjeWind is a 795 MW offshore wind farm under construction in the Dutch North Sea, developed by RWE and TotalEnergies for operation by early 2028.

Sep 24, 2026

Oranmiyan

Oranmiyan, also written Oranyan, is a founder figure in Yoruba and Benin tradition, remembered as the fourth Ooni of Ife and founder of the Oyo and Benin royal dynasties.

Orano

Orano is a French nuclear fuel-cycle company, majority owned by the French state, that covers uranium mining, conversion, enrichment, spent-fuel recycling, dismantling, and medical isotopes.

Orantinib

Orantinib (SU6668, TSU-68) is an investigational anticancer drug, an orally bioavailable tyrosine kinase inhibitor blocking VEGFR2, PDGFR, and FGFR, developed by Sugen and never approved.

Oct 22, 2026

Orapa diamond mine

The Orapa diamond mine is an open-pit mine in Botswana's Central District, opened on 1 July 1971 as the country's first diamond mine, operated by Debswana.

ORARAD (Clinical Registry of Dental Outcomes in Head and Neck Cancer Patients, NCT02057510) is a NIDCR-funded, six-site US prospective cohort of 572 head and neck cancer radiotherapy patients, reporting 17.7% two-year tooth failure, 3.1% confirmed osteoradionecrosis, and post-RT caries increment.

ORAS5

ORAS5, or Ocean Reanalysis System 5, is ECMWF's fifth-generation global ocean and sea-ice reanalysis, operational since 2016, providing ocean and sea-ice initial conditions for all its coupled forecasting systems.

Sep 19, 2026

Orascom

Orascom, also known as the Orascom Group, is an Egyptian family conglomerate founded in 1976 by Onsi Sawiris and divided among his three sons in the 1990s.

Sep 19, 2026

Orascom Development Holding AG

Orascom Development Holding AG is a resort-town developer founded by Egyptian entrepreneur Samih Sawiris, known for El Gouna on Egypt's Red Sea, begun in 1989.

Orăştiora de Sus

Orăștioara de Sus, a commune in Hunedoara County, Romania, holds Sarmizegetusa Regia, the Dacian capital, other UNESCO Orăștie Mountains fortresses, and a Roman auxiliary fort at Bucium with Trajanic and Hadrianic phases.

Orator

Orator: a skilled public speaker, Greek rhētōr (ῥήτωρ). Oratory became a distinct genre in late fifth-century Greece, matured in the fourth century with the Ten Attic orators, and was theorized by Aristotle and Cicero.

Oratorio

An oratorio, or Oratorium, is a large-scale musical work for solo voices, chorus, and orchestra on a sacred story, performed in concert without staging; Handel's Messiah is the best-known example.

Oratory (chapel)

Орнітарій (oratoriy, Latin oratorium) is a private chapel in Western Christianity for a specific community's rites, protected by canon law; the same prayer houses gave the name to the musical oratorio genre.

Orava Ethnographic Park Museum

Orava Ethnographic Park Museum (Muzeum – Orawski Park Etnograficzny w Zubrzycy Górnej), a Polish open-air skansen in Zubrzyca Górna around Moniak's Manor, opened 1955, about 12 ha with 60 buildings of Orava folk architecture.

Oct 10, 2026

Orazio Attanasio

Orazio Attanasio, also known as Orazio Pietro Attanasio, is an Italian-British economist, Cowles Professor at Yale since 2019, known for randomized trials of early-childhood interventions in developing countries.

Orazio Fagone

Orazio Fagone, Italian short-track speed skater born 1968 in Catania; 1994 Lillehammer Olympic 5,000 m relay gold, five world titles, and 2006 Paralympic sledge hockey competitor after a 1997 motorcycle accident.

Oct 22, 2026

Orazio Gentileschi

Orazio Gentileschi (1563–1639) was an Italian Baroque painter born in Pisa who adopted Caravaggio's naturalism in Rome, then worked for the courts of Paris and London.

Sep 27, 2026

Orazio Schillaci

Orazio Schillaci, born 1966, is an Italian politician and former rector of the University of Rome Tor Vergata who has been Minister of Health since 2022.

ORB (feature descriptor)

ORB (Oriented FAST and Rotated BRIEF) is a fast binary feature descriptor and keypoint detector for computer vision, published in 2011 as an alternative to SIFT and SURF.

ORB-SLAM

ORB-SLAM is a real-time feature-based monocular SLAM system created at the University of Zaragoza, Spain, and published in 2015; its successors ORB-SLAM2 and ORB-SLAM3 added stereo, RGB-D, and visual-inertial support.

Orb-weaver spider

Orb-weaver spiders build wheel-shaped aerial orb webs; the group includes Araneidae (about 3,041 species, 176 genera), Tetragnathidae, and others, dating to the Jurassic with debated single versus multiple web origins.

Orb-weaver spiders of Australia and Oceania

Orb-weaver spiders of Australia and Oceania are web-building species constructing circular webs across many families, including garden and golden orb-weavers, whose classifications are still being redrawn.

Orb: On the Movements of the Earth

Orb: On the Movements of the Earth (チ。―地球の運動について―) is Uoto's historical manga about heliocentrism research in 15th-century Poland, serialized 2020–2022 in Big Comic Spirits, winner of the Tezuka Osamu Cultural Prize, adapted into a 2024 Madhouse anime on Netflix.

Orban

Orban, also spelled Urban, was a cannon founder, probably Hungarian, who cast the giant bombard with which Sultan Mehmed II's army breached the walls of Constantinople in 1453.

Orbaniacum

Orbaniacum, also Orbigniacum, a Gallo-Roman vicus near Tours identified with Orbigny, Indre-et-Loire, France; a church was built there under Bishop Euphronius per Gregory of Tours, Hist. X.31; Pleiades 138503, Barrington Atlas 14 G1.