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All articles starting with Q

2,252 articles

Quinapril

Quinapril, originally marketed as Accupril, is an ACE inhibitor prodrug converted in the body to its active form quinaprilat, used to treat high blood pressure and, as adjunctive therapy, heart failure.

Quinatzin

Quinatzin, also given as Quinantzin, was the fourth ruler of the Chichimeca dynasty, who moved its capital to Texcoco around 1298 and allied with the Acolhua.

Quinazoline

Quinazoline is an aromatic bicyclic organic compound, a fused benzene–pyrimidine ring system with formula C₈H₆N₂, first synthesized in 1895 and the scaffold of many drugs and about 150 natural alkaloids.

Quinbrook Infrastructure Partners

Quinbrook Infrastructure Partners is a specialist energy-transition infrastructure investment manager founded by Rory Quinlan and David Scaysbrook, based in Jersey with advisers in the US, UK, and Australia.

Quincas Borba

Quincas Borba is an 1891 novel by the Brazilian writer Machado de Assis, in which a schoolteacher inherits a philosopher's fortune and is exploited into madness.

Quince

Quince (Cydonia oblonga, membrillo fruit) is a Rosaceae small tree from Trans-Caucasia and north Iran, domesticated in Mesopotamia by 5000-4000 BC; fragrant golden pome fruit cooked into paste, jelly, and jam, also a pear rootstock; Türkiye leads 2022 production.

Quince (company)

Quince is a San Francisco direct-to-consumer company founded in 2018, best known for its $50 Mongolian cashmere sweater and a manufacturer-to-consumer model that ships directly from partner factories.

Quince cheese

Quince cheese, also called dulce de membrillo or quince paste, is a dairy-free, sliceable paste of quince pulp and sugar set by the fruit's high pectin, classically served with Manchego as queso y dulce.

Quince Therapeutics

Quince Therapeutics is a clinical-stage biopharmaceutical company in South San Francisco, California, traded on Nasdaq as QNCX, which acquired Orphai Therapeutics in 2026 to develop inhaled rapamycin after its lead drug failed a Phase 3 trial.

Quinceañera

Quinceañera (fiesta de quince años): Latin American coming-of-age celebration of a girl's 15th birthday, blending Mesoamerican puberty rites and Spanish Catholic tradition, with Mass, court of honor, waltz, and shoe-changing rituals.

Quincke effect

The Quincke effect, also called Quincke rotation, is the spontaneous rotation of dielectric particles in a conducting liquid under a strong enough DC electric field.

Quincke roller

A Quincke roller is a dielectric colloidal particle that spontaneously rotates and rolls in a weakly conducting fluid above a threshold DC electric field, named for G. Quincke.

Quinclorac

Quinclorac (3,7-dichloro-8-quinolinecarboxylic acid, BAS 514H) is a quinolinecarboxylic acid synthetic auxin herbicide, first US-registered in 1992, controlling barnyardgrass and broadleaf weeds in rice and turf via ethylene- and cyanide-mediated toxicity.

Quincunx

A quincunx is an arrangement of five objects, four at the corners of a square and one at the center, like a die's five face.

Quincy (actor)

Quincy (Quincy Taylor Brown, born 1991) is an American actor and singer, biological son of Al B. Sure! and Kim Porter, adopted by Diddy; known for Dope and Fox's Star.

Quincy Carter

Quincy Carter, Decatur, Georgia quarterback; Southwest DeKalb star, Georgia Bulldogs, Dallas Cowboys 2001-2004 starter (18-16, 71.7 rating), 2003 playoff season, waived 2004, later CFL/arena, and coaching.

Quincy Hall

Quincy Hall (born 1998, Kansas City, Missouri) is an American 400m and 400m hurdles runner; Olympic 400m champion at Paris 2024 in 43.40, fourth-fastest ever, and 2023 world 4x400m relay champion.

Quincy Institute for Responsible Statecraft

Quincy Institute for Responsible Statecraft (QI): transpartisan Washington think tank founded December 2019, named for John Quincy Adams, funded by Open Society Foundations and Charles Koch Foundation, advocating military restraint and diplomacy, publisher of Responsible Statecraft.

Quincy Isaiah

Quincy Isaiah (born 1996) is an American actor from Muskegon, Michigan, whose breakout first major role was Earvin "Magic" Johnson in HBO's Winning Time: The Rise of the Lakers Dynasty; later credits include Nemesis, The Fix, and John Rambo.

Quincy Jones

Quincy Jones (Quincy Delight Jones Jr., 1933–2024) was an American jazz trumpeter, arranger, composer, and record producer who shaped Michael Jackson's Off the Wall, Thriller, and Bad, won 28 Grammys from 80 nominations, and led Mercury Records as an early Black major-label executive.

Quincy Jones III

Quincy Jones III (QDIII, QD3), born 1968, Swedish-American hip-hop producer and son of Quincy Jones; produced 2Pac, Ice Cube, LL Cool J, founded QD3 Entertainment, made the Beef documentaries and The Carter.

Quincy Porter (American football)

Quincy Porter is an American college football wide receiver from Oradell, New Jersey, a five-star 2025 Bergen Catholic recruit who played one season at Ohio State (4 catches, 59 yards) before transferring to Notre Dame in January 2026, where knee surgery ended his 2026 season before it began.

Quincy Promes

Quincy Promes, born 1992 in Amsterdam, Dutch international winger (50 caps, 7 goals) for Twente, Spartak Moscow, Sevilla, and Ajax; convicted in absentia of cocaine smuggling (six years) and stabbing his cousin (18 months), extradited from Dubai in 2025.

Quincy University

Quincy University, founded 1860 as St. Francis Solanus College, is a private Catholic Franciscan liberal arts university in Quincy, Illinois, with about 1,185 students, 21 NCAA Division II sports, and Higher Learning Commission accreditation.

Quincy Watts

Quincy Watts, American sprinter born 1970 in Detroit, won 1992 Olympic 400m gold in 43.50 and 4x400m relay gold in world record 2:55.74; his 2:54.29 1993 relay world record still stands; now USC track director.

Quincy Wilson (runner)

Quincy Wilson, American 400m sprinter from Bullis School, Potomac, Maryland; youngest US male track Olympian and youngest male Olympic track gold medalist (Paris 2024 4x400m relay heats); PB 44.10; committed to Maryland.

Quincy Wright

Quincy Wright (1890–1970) was an American political scientist and authority on international law at the University of Chicago, best known for his two-volume A Study of War (1942).

Quincy, Illinois

Quincy, Illinois, the "Gem City," is a Mississippi River city and seat of Adams County founded by John Wood in 1819, once Illinois' second-largest city, site of an 1858 Lincoln-Douglas debate, with about 39,000 residents.

Quincy, M.E.

Quincy, M.E. is an NBC crime drama (October 3, 1976 to 1983) starring Jack Klugman as Dr. Quincy, a Los Angeles County medical examiner. Begun as NBC Sunday Mystery Movie telefilms, it pioneered forensic investigation drama before CSI and later tackled social issues.

Quincy, Massachusetts

Quincy, Massachusetts, the "City of Presidents," is a coastal city south of Boston, birthplace of John Adams and John Quincy Adams, with 101,636 residents (2020), Adams National Historical Park, granite heritage, and a 33% foreign-born population.