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Area of Outstanding Natural Beauty
Area of Outstanding Natural Beauty (AONB), now National Landscapes: UK landscape designation under the 1949 NPACA and CROW Act 2000; 34 in England, 46 total; purpose to conserve and enhance natural beauty.
Area operator
The area operator in loop quantum gravity measures the area of a two-dimensional surface, with a purely discrete spectrum first computed by Rovelli and Smolin in 1995.
Area rule
The area rule, also known as the Whitcomb area rule, is an aerodynamic principle from 1952 stating that smoothing an aircraft's cross-sectional area distribution minimizes transonic drag.
Area sampling
Area sampling is a survey sampling method in which geographic areas are selected as intermediate units before sampling the households, farms, or land plots that are the actual survey targets.
Area Scheibler
Area Scheibler (ex Area Scheibler, Via Caruso) is an archaeological site in western Pisa crossed by the ancient Auser river, with Bronze Age to medieval occupation, a Roman riverbank with navalia, and a 7th-century Lombard necropolis.
Area Synest
Area Synest (Θεματικό Πάρκο Σινεβρού) is a theme park and nature resort in the mountain village of Synevro in Aigialeia, Achaea, Greece, created by architect Martik Manikian over 24 years.
Area under the curve (pharmacokinetics)
Area under the curve (AUC) in pharmacokinetics: integral of plasma concentration over time, the standard measure of systemic drug exposure; variants AUC0-t, AUC0-inf, AUC0-TAU; trapezoidal calculation; 80-125% bioequivalence criterion.
Area-selective deposition
Area-selective deposition (ASD) is a thin-film fabrication method in which material grows only on predefined regions of a surface, guided by chemical differences instead of post-deposition etching.
Areas of Hong Kong
Areas of Hong Kong (香港地區): the 18 districts, four on Hong Kong Island, five in Kowloon, nine in the New Territories, with land areas, 2021 populations, and the 44 District Council geographical constituencies.
Areca
Areca (betel nut palms) is a genus of about 45 accepted species of single-stemmed Asian palms in Arecaceae, native from South China and India to the Solomon Islands; Areca catechu yields the areca nut chewed by over 400 million people, and the houseplant "areca palm" is actually Dypsis lutescens.
Areca catechu
Areca catechu (betel nut palm, binomial Areca catechu L., 1753) is a Philippine-native Arecaceae palm whose areca nut, chewed by over 600 million people with betel leaf and lime, is an IARC Group 1 human carcinogen.
Areca nut
Areca nut (betel nut), seed of the palm Areca catechu, chewed by over 10% of the world's population; IARC Group 1 carcinogen causing oral cancer and oral submucous fibrosis; its main alkaloid arecoline is Group 2B.
Arecaceae
Arecaceae (Palmae) is a family of monocot plants in the order Arecales. It is globally significant as one of the most important families for wild extracted resources.
Arecales
Arecales is an order of monocot flowering plants, named by Bromhead in 1840, containing the palms (Arecaceae) and Dasypogonaceae; it sits in the commelinid clade alongside Poales, Zingiberales, and Commelinales.
Arechi-ha
Arechi-ha (荒地派, "the Waste Land school") was a group of Japanese poets formed around the magazine Arechi, named after T. S. Eliot's The Waste Land.
Arecibo Catena
Arecibo Catena is a 139.79 km crater chain (catena) on Mercury at 27.58S, 28.29E, IAU-approved March 26, 2013, named for the Arecibo radio telescope in Puerto Rico; formerly Arecibo Valles.
Arecibo message
The Arecibo message is a 1,679-bit radio transmission sent toward the star cluster Messier 13 from the Arecibo Observatory, Puerto Rico, in 1974, carrying a pictorial summary of humanity and the solar system.
Arecibo Observatory
The Arecibo Observatory, also known as the National Astronomy and Ionosphere Center, was a 305-meter radio telescope in Puerto Rico that operated from 1963 until its collapse in 2020.
Arecibo, PR Metro Area
Arecibo, PR Metro Area: a Puerto Rico metropolitan statistical area (code 11640) covering Arecibo, Camuy, Hatillo, and Quebradillas municipios; about 180,767 residents, median household income $25,084, principal city Arecibo.
AREDS2 trial
AREDS2 (Age-Related Eye Disease Study 2), NEI-sponsored 2006-2012 randomized trial of 4,203 participants testing lutein/zeaxanthin and omega-3 additions to the AREDS AMD supplement; defined the beta-carotene-free AREDS2 formula.
Aree Valyasevi
Aree Valyasevi (อารี วัลยะเสวี) was a Thai pediatrician and nutrition scientist who founded the Institute of Nutrition at Mahidol University. His work addressed rural malnutrition and bladder stone disease.
Aref
Aref (عارف), fully Aref Arefkia, was an Iranian pop singer and actor nicknamed Sultan of Hearts, a pre-revolution radio star who spent decades in exile and died in 2026.
Aref Qazvini
Aref Qazvini, full name Abu'l-Qāsem ʿĀref Qazvīnī (عارف قزوینی, ca. 1882–1934), was an Iranian poet and singer, the leading composer of political songs of the Persian Constitutional Revolution era.
AREG
AREG (amphiregulin, AR, SDGF, CRDGF) is a human chromosome 4q13.3 gene encoding a 252-amino-acid EGF-family ligand of EGFR, released by ADAM17 cleavage; it drives tissue repair, type 2 immunity, fibrosis, and cancer, and serves as a biomarker in sepsis and anti-EGFR therapy.
Areika
Areika is an archaeological site in Lower Nubia, a fortified settlement of the cattle-herding C-Group people, excavated in the early twentieth century and now submerged under Lake Nasser.
Areíto
The areíto (also areyto) was the principal collective ceremony of the Taíno people of the Caribbean, combining music, song, dance, and recitation to preserve communal history.
Arekapudi Gandhi
Arekapudi Gandhi (ఆరెకపూడి గాంధీ) is an Indian politician, MLA for Serilingampally, Telangana, since 2014, winning in 2014 (TDP), 2018 (TRS), and 2023 (BRS); he joined the Congress in July 2024 and chairs the Assembly PAC.
Arella
Arella (Angela Roth) is a DC Comics character created by Wolfman, Pérez, and Chiaramonte, first appearing in The New Teen Titans #4 (1981). Mother of Raven by Trigon, renamed "Messenger Angel" in Azarath, she died merging into Phantasm.
AREMA
AREMA, founded by President Didier Ratsiraka in March 1976 as the Vanguard of the Malagasy Revolution, was the ruling party of Madagascar's socialist Second Republic.
Arena
An arena is a building with a central area for sports, entertainment, or public events, surrounded by spectator seats; the word also names the central space itself.