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Arcturus (band)
Arcturus is an avant-garde/symphonic black metal band from Oslo, Norway, formed in 1990 from members of Mortem, with Sverd, Hellhammer, and vocalists Garm and ICS Vortex; not the same as the US band of that name.
Arcus Biosciences
Arcus Biosciences is a clinical-stage biopharmaceutical company in Hayward, California, founded in 2015 by Terry Rosen and Juan Jaen, developing cancer drugs including casdatifan and quemliclustat.
Arcus cloud
The arcus cloud, also called an arc cloud, is a dense, low, horizontal roll or wedge cloud forming along a thunderstorm's gust front, as shelf or roll clouds.
Arcus senilis
Arcus senilis (corneal arcus, gerontoxon): gray-white lipid ring in the peripheral cornea, common after 50, harmless to vision; premature arcus (arcus juvenilis) flags dyslipidemia and cardiovascular risk.
ARD (broadcaster)
ARD, the Consortium of public-law broadcasting institutions of the Federal Republic of Germany, is a consortium of nine regional public broadcasters plus Deutsche Welle that jointly stage German television programs.
Ard Saouda
Ard Saouda, also written Ard es Saoude, is a Heavy Neolithic site of the Qaraoun culture in Lebanon's Wadi al-Taym, with an adjacent Acheulean flint scatter.
Ard Schenk
Ard Schenk (Adrianus Schenk) is a Dutch former speed skater, born in 1944, who won three gold medals at the 1972 Sapporo Winter Olympics and set 18 world records.
Ard Tlaili
Ard Tlaili is a small Neolithic tell in the Beqaa Valley, Lebanon, 11 km northwest of Baalbek, occupied about 5000 to 4700 BC and known for Halaf-style painted pottery, the most southerly found.
Arda Güler
Arda Güler (born 2005, Ankara) is a Turkish attacking midfielder for Real Madrid and Türkiye, signed from Fenerbahçe in 2023, EURO 2024 youngest goalscorer, and 2025/26 Champions League Revelation of the Season.
Arda Turan
Arda Turan (Arda Turan), born 1987 in Istanbul, Turkish midfielder for Galatasaray, Atlético Madrid, and Barcelona; now Shakhtar Donetsk head coach, winning the 2025/26 Ukrainian title.
Arda Valles
Arda Valles, a Martian valley network in the southern highlands (center -20.40, 327.69 E), IAU-approved 1976, named for an ancient Bulgarian river, about 174 km across.
Arda-Mulissu
Arda-Mulissu, also written Arda-Muliššu and known biblically as Adrammelech, was an Assyrian prince disinherited by Sennacherib in favor of Esarhaddon, and named as his father's murderer in 681 BC.
Ardabīl
Ardabīl (اردبیل), or Ardabil, is the capital of Ardabil Province in northwestern Iran, on a cold plateau near Mount Sabalan. Population 529,374 (2016); home of the UNESCO-listed Sheikh Safi al-Din shrine, birthplace of the Safavid order.
Ardabil Carpet
The Ardabil Carpet is a large knotted-pile Persian carpet dated by its inscription to 1539-40, made under Iran's Safavid dynasty and held in London's Victoria and Albert Museum since 1893.
Ardagh Chalice
The Ardagh Chalice is an 8th-century silver two-handled chalice found in 1868 in a hoard near Ardagh, County Limerick, Ireland, and now held by the National Museum of Ireland.
Ardal O'Hanlon
Ardal O'Hanlon (born 1965) is an Irish comedian, actor and novelist, co-founder of Dublin's Comedy Cellar, best known as Father Dougal in Father Ted, lead of My Hero and Death in Paradise's DI Jack Mooney.
Ardalan
Ardalan, full name Ardalan Noghre-Kar, is an Iranian-born house producer and DJ based in the United States, best known for his work with Dirtybird Records.
Ardalan Armin
Ardalan Armin is a physicist at Swansea University who studies organic solar cells and photodiodes built from soft semiconductors, known for work on charge generation.
Ardalan dynasty
The Ardalan dynasty (اردلان) was a Kurdish ruling family whose principality, centered on Sanandaj in western Iran, held semi-autonomous status under Safavid and Qajar rule until 1867–1868.
Ardalan Esmaili
Ardalan Esmaili (أردالان إسماعيلي), born 1986 in Tehran, is a Swedish-Iranian actor trained at Stockholm Academy of Dramatic Arts, known for The Charmer (2017), Black Crab, Snabba Cash, Opponent, The Helicopter Heist, and as Abdelbaset Al Megrahi opposite Colin Firth in Lockerbie: A Search for Truth (2025).
Ardashir I (اردشیر یکم)
Ardashir I (اردشیر یکم), founder of the Sasanian empire; Middle Persian ʾrthštr. Defeated Parthian king Artabanus IV at Hormozdgan in 224 CE, took the title Šāhānšāh, adopted Ērānšahr, and died early 242 CE.
Ardashir I's eastern campaigns
Ardashir I's eastern campaigns were the early-3rd-century wars by which Sasanian founder Ardashir I, after defeating Artabanus V in 224, extended his rule across eastern Iran.
Ardashir I's wars of unification
Ardashir I's wars of unification were the campaigns by which Ardashir I of Persis overthrew the Parthian king Artabanus, killed at the Battle of Hormozdgan in 224, ending Parthian rule and founding the Sasanian Empire.
Ardashir II
Ardashir II was Sasanian king of kings of Iran from 379 to 383, a half-brother of Shapur II, deposed by the nobles in favor of Shapur III.
Ardashir III
Ardashir III (621–629) was a boy king of the Sasanian Empire, son of Kavad II, proclaimed king at about seven in 628 and murdered in 629 when Shahrbaraz seized the throne.
Ardat-lilî
Ardat-lilî (wardat-lilîm; KI.SIKIL.LÍL.LÁ), Akkadian maiden-demon of the Mesopotamian lil-demon family, equated with Sumerian Kisikillila, preying on young men and linked to the later Jewish Lilith.
Ardata
Ardata was a Late Bronze Age city-state in northern Lebanon, identified with the tell of Arde (Ardeh) near Tripoli, known chiefly from the Amarna letters of the fourteenth century BC.
Ardea (animal)
Ardea is the genus of great herons (family Ardeidae, order Pelecaniformes) holding the grey heron, great blue heron, great egret, and goliath heron; its boundaries shifted as egrets were moved in.
Ardeatine massacre
The Ardeatine massacre (Fosse Ardeatine): Nazi German forces shot 335 Italian prisoners in Rome's Ardeatine Caves on 24 March 1944, a 10-for-1 reprisal ordered after the GAP partisans' Via Rasella bombing.
Ardeb
The ardeb (also spelled ardabb; Arabic إردب) is a traditional unit of dry capacity for grain in Egypt and Sudan, standardized in Egypt in 1891 at 198 liters.