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Atomic spies
Atomic spies were Soviet intelligence recruits who passed secrets of the American atomic program to the USSR, including designs by Klaus Fuchs, accelerating the Soviet bomb's development.
Atomic switch
An atomic switch is a nanoionic device that controls the diffusion and redox of metal ions to form a conductive filament between electrodes, usable as nonvolatile memory, a switch, or an artificial synapse.
Atomic-clock dark matter searches
Atomic-clock dark matter searches are experiments that look for ultralight dark matter by monitoring atomic clock rates, setting tighter coupling limits though no signal has been found.
Atomically precise gold nanoclusters
Atomically precise gold nanoclusters are ligand-protected gold particles, typically 1–3 nm and tens to hundreds of gold atoms, with exactly defined composition and solved atomic structures.
Atomically thin p–n junction
An atomically thin p–n junction is a semiconductor diode whose p-type and n-type regions are each one or a few atomic layers of 2D materials thick.
Atomicity (database systems)
Atomicity, also called an atomic transaction, is the database property that a transaction either completes entirely or not at all; it is the A in the ACID properties.
Atomico
Atomico is a European venture capital firm based in London, founded in 2006 by Skype co-founder Niklas Zennström, with investments including Stripe, Klarna, and DeepL.
Atomism
Atomism is the doctrine that reality consists of indivisible minimal parts, from Greek atomos (uncuttable). Founded by Leucippus and Democritus, paralleled in Indian Nyāya-Vaiśeṣika, Buddhist and Jaina theories; revived by Epicurus, Lucretius and seventeenth-century science.
Atomium
The Atomium is a 102-meter building in Brussels, Belgium, built as the flagship of the 1958 World's Fair and shaped as a magnified iron crystal unit cell.
AtomNet
AtomNet is a deep convolutional neural network that predicts the bioactivity of small molecules bound to protein targets, introduced in 2015 by Atomwise in San Francisco.
Atomoxetine
Atomoxetine (Strattera), a selective norepinephrine reuptake inhibitor, is the first non-stimulant FDA-approved ADHD medication (2002, Eli Lilly), used after stimulant failure or intolerance, metabolized by CYP2D6, with a pediatric suicidal-ideation boxed warning; brand discontinued in favor of generics.
Atoms for Peace (band)
Atoms for Peace: Thom Yorke and Nigel Godrich's supergroup with Flea, Joey Waronker, and Mauro Refosco, formed 2009 in Los Angeles to play The Eraser live; one album, AMOK (XL, 2013).
Atomwaffen Division
Atomwaffen Division (AWD, German for "atomic weapons"), later the National Socialist Order, a neo-Nazi accelerationist network founded 2015 by Brandon Russell on Iron March, linked to murders, plots, and prosecutions in the US and proscribed abroad.
Atomwise (now Numerion Labs)
Atomwise, now Numerion Labs, is a San Francisco biotechnology company that applies deep learning to small-molecule drug discovery through its AtomNet platform, co-founded by Abraham Heifets and Izhar Wallach.
Atonality
Atonality: music lacking a tonal center, associated with the Second Viennese School (Schoenberg, Berg, Webern) around 1911, analyzed by pitch-class set theory and studied for its weaker listener expectancies.
Atonement (2007 film)
Atonement (2007) is Joe Wright's film adaptation of Ian McEwan's novel, scripted by Christopher Hampton, starring Keira Knightley, James McAvoy, and Saoirse Ronan; it won the Oscar for Best Original Score and the BAFTA for Best Film.
Atonement (2026 film)
Atonement (2026 film), Reed Van Dyk's debut drama based on Dexter Filkins' 2012 New Yorker article about a Marine seeking forgiveness from an Iraqi family, premiered at Cannes Directors' Fortnight and was released by Kino Lorber on October 2, 2026.
Atonement (Killswitch Engage album)
Atonement is Killswitch Engage's eighth studio album, released August 16, 2019 on Metal Blade Records, the first after Jesse Leach's vocal cord surgery, with guests Howard Jones and Chuck Billy and a Grammy nomination for Unleashed.
Atonement (novel)
Atonement is a 2001 novel by Ian McEwan about Briony Tallis, who as a girl falsely accuses her sister's lover of a crime and seeks atonement through writing.
Atong Ang
Atong Ang, born Charlie Tiu Hay Sy Ang in 1957, is a Filipino businessman associated with gambling and e-sabong who came to public attention during the 2000 Estrada events.
Atonia
Atonia is the complete loss of muscle tone, an ICD-11 symptom code (MB45.2) and a normal feature of REM sleep. Its failure causes REM sleep behavior disorder; inappropriate activation causes cataplexy in narcolepsy.
Atopic dermatitis
Atopic dermatitis (eczema) is a chronic, itchy inflammatory skin disease affecting up to 25% of children, driven by skin barrier defects, Th2 inflammation, and pruritus; treated with topicals, biologics like dupilumab, and JAK inhibitors.
Atopic dermatitis in infants and children
Atopic dermatitis in infants and children, also called atopic eczema, is a chronic itchy inflammatory skin disease that usually begins before age 5 and often improves with age.
Atopic keratoconjunctivitis
Atopic keratoconjunctivitis, first described by Hogan in 1953, is a chronic bilateral inflammation of the conjunctiva and cornea in people with atopic dermatitis, and can threaten vision.
Atopic prurigo
Atopic prurigo (ICD-11 EC91.1) is a clinical variant of atopic eczema with multiple discrete itchy, excoriated papules on the limbs, bridging atopic dermatitis and chronic prurigo; about half of prurigo patients are atopic, and systemic steroids are not recommended.
Atopy
Atopy: a genetic tendency to produce IgE antibodies against environmental allergens, causing allergic rhinitis, asthma, atopic dermatitis, and food allergy; term coined by Coca and Cooke in 1923.
Atorvastatin
Atorvastatin, sold originally as Lipitor, is a statin medicine that blocks cholesterol synthesis, lowering LDL cholesterol by up to about 50% and preventing heart attacks and strokes.
Atos
Atos SE is a French multinational information technology services company formed in 1997 from the merger of Axime and Sligos, best known as the Olympics' worldwide IT partner.
Atosiban
Atosiban (Tractocile) is a synthetic oxytocin receptor antagonist peptide used as a tocolytic to delay preterm birth at 24 to 33 weeks gestation; given by IV bolus plus 48-hour infusion, it matches beta-agonists and nifedipine in efficacy with fewer maternal side effects.
Atossa
Atossa (آتوسا) was an Achaemenid Persian royal woman, daughter of Cyrus the Great, wife of Cambyses II and Darius I, and mother of Xerxes I.