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Arable land
Arable land is land used in most years for growing temporary crops that must be newly sown after each harvest, including land left temporarily fallow for under five years.
Årabrot
Årabrot is a Norwegian noise rock band formed in 2001 in Haugesund and named after a garbage dump, led by Kjetil Nernes and Karin Park.
Arabs (العرب)
Arabs (العرب, al-ʿArab) are the Arabic-speaking peoples of the Arabian Peninsula, Middle East, and North Africa. The name first denoted northern nomad tribes, expanded to all peninsula inhabitants, and Arab identity was shaped in the early Islamic Caliphate.
Arabs Got Talent
Arabs Got Talent is the Arabic version of the Got Talent format, broadcast by MBC since January 2011 and open to performers from across the Arab world.
Arabsat
Arabsat (عربسات), formally the Arab Satellite Communications Organization, is an intergovernmental satellite operator established in 1976 by 21 Arab League states and headquartered in Riyadh, Saudi Arabia.
Arabshahid dynasty
The Arabshahid dynasty, also known as ʿArabšāhī, was a Chingisid dynasty named for ʿArabšāh b. Fūlād that ruled Khwarazm, around the lower Amu Darya, from 1511, with its capital eventually at Khiva.
Aracaju
Aracaju, capital of Sergipe, Brazil; planned coastal city founded 1855 on a grid by engineer Pirro, replacing São Cristóvão; 602,757 residents (2022), Tupi name meaning cashew tree of parrots.
Aracar
Aracar is a 6,095 m Holocene stratovolcano in Salta Province, northwestern Argentina, near the Chilean border, with a 1-1.5 km summit crater lake, no confirmed historical eruptions, and no monitoring.
Araçatuba
Araçatuba, São Paulo municipality (code 3502804), Brazil; founded 2 December 1908 on the Noroeste do Brasil railway; 200,124 residents (2022 census), Capital Regional C, GDP per capita R$ 57,253.20 (2023).
Araceae
Araceae, the arum family (spathe and spadix plants, including duckweeds Lemnoideae), is a monocot family in Alismatales with about 144 genera and 3,650–4,000 species, early Cretaceous fossils, thermogenic inflorescences, and staple crops taro and tannia.
Araceae taxonomy and systematics
The taxonomy of Araceae, the arum family, classifies about 150 genera and over 4,600 species into eight subfamilies, with duckweeds nested inside and generic limits actively redrawn.
Araceli Martinez-Olguin
Araceli Martinez-Olguin (Araceli Martínez-Olguín), born 1977 in Mexico City, is a US district judge for the Northern District of California, appointed by President Biden in 2023 after a career as an immigrants' rights attorney.
Aracely Arámbula
Aracely Arámbula (La Chule), Mexican actress and singer born 1975 in Chihuahua, star of telenovelas Abrázame muy fuerte, La patrona and La doña, two solo albums, ex-partner of Luis Miguel.
Arachidic acid
Arachidic acid, also called eicosanoic acid or icosanoic acid, is a saturated long-chain fatty acid with 20 carbon atoms, found in peanut oil and used in lubricants, waxes, and cosmetics.
Arachidonate metabolism
Arachidonate metabolism (arachidonic acid cascade): enzymatic conversion of arachidonic acid, released from membrane phospholipids by phospholipase A2, into eicosanoids via COX, lipoxygenase, and cytochrome P450 pathways.
Arachidonic acid
Arachidonic acid (AA, 20:4n-6), an essential omega-6 polyunsaturated fatty acid precursor of prostaglandins and leukotrienes via COX, LOX, and CYP pathways; discovered 1909, typical intake 100–200 mg/d.
Arachis
Arachis (peanut genus) is a South American legume genus in Fabaceae, tribe Dalbergieae, with about 69-84 species in nine sections; its type species Arachis hypogaea is the allotetraploid cultivated peanut derived from A. duranensis and A. ipaensis.
Arachis pintoi
Arachis pintoi (pinto peanut, forage peanut, maní forrajero), a stoloniferous perennial Fabaceae legume from central Brazil, used as tropical forage, cover crop, and living mulch; fixes 88–244 kg N/ha/yr; cultivar Amarillo; high invasion risk in Florida.
Arachnaion (mountain)
Arachnaion (Αραχναίο, Arachnaeus) is a 1,197 m limestone mountain in Argolis, Greece, near Epidaurus, with ancient altars of Zeus and Hera for rain sacrifices and a role in Aeschylus' Agamemnon beacon chain.
Arachne (Ἀράχνη)
Arachne (Ἀράχνη), Lydian weaver of Greek myth, daughter of Idmon of Colophon, challenged Athena to a weaving contest and was transformed into a spider; source of 'Arachnida', told in Ovid's Metamorphoses 6.5–145.
Arachne Linea
Arachne Linea is a 954-km IAU-named linea, a complex of ridges and bands, on Jupiter's moon Europa in the Castalia region near 10-11 degrees S, a reconstructed plate boundary recording episodic extension and convergence in Europa's ice shell.
Arachnid
Arachnids (class Arachnida) are eight-legged arthropods including spiders, scorpions, harvestmen, pseudoscorpions, ticks, and mites, with about 93,000 described species, a Silurian fossil record, contested monophyly, and spiders killing 400–800 million tons of prey yearly.
Arachnoid cyst
An arachnoid cyst is a benign, fluid-filled sac within the arachnoid layer of the membranes around the brain and spinal cord, filled with cerebrospinal fluid and usually found by accident on imaging.
Arachnoiditis
Arachnoiditis: chronic inflammation of the spinal arachnoid mater causing pain and neurological deficits; also called chronic adhesive arachnoiditis or spinal adhesive arachnoidopathy; causes include spinal surgery, myelography dye, trauma, and infections like tuberculosis; no cure, symptom-based treatment.
Arachnophobia
Arachnophobia, the intense fear of spiders, is among the most common specific phobias (3–15% prevalence), more frequent in women, driven by fear and disgust, and treated mainly with CBT and exposure therapy.
Arachnophobia (film)
Arachnophobia (1990) is a horror-comedy, Frank Marshall's directing debut and Hollywood Pictures' first release, starring Jeff Daniels, John Goodman, and Julian Sands as a Venezuelan spider invades a California town.
Arachnophobia in popular culture
Arachnophobia in popular culture traces spider fear as a word coined in 1884, a horror symbol predating cinema, and a modern brand anchored by the 1990 film Arachnophobia.
Arachosia
Arachosia (Old Persian Harauvatiš, Avestan Haraxvaiti) was an Achaemenid satrapy around modern Kandahar, Afghanistan, named for the Arghandab river; ruled successively by Achaemenids, Alexander's generals, Ashoka, Seleucids, Bactrians, Parthians, and Sakas.
Arad
Arad is a county (județ) in western Romania on the Hungarian border, capital city Arad; 410,058 residents in 2026, Mureș River corridor, Codru-Moma mountains, large agriculture and rolling-stock industry.
Arad ostraca
The Arad ostraca, also known as the Arad letters, are Hebrew ink inscriptions on pottery from the Judahite fortress at Tel Arad, written around 600 BCE.