All articles A–Z
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Silent myocardial infarction
A silent myocardial infarction is a heart attack that causes no symptoms or only vague ones, recognized later on a routine ECG or imaging study.
Silent myocardial ischemia
Silent myocardial ischemia, also called silent ischemia, is reduced blood flow to the heart muscle without angina symptoms, the most common manifestation of coronary artery disease.
Silent Night
Silent Night (Stille Nacht, heilige Nacht), Austrian Christmas carol: lyrics by Joseph Mohr 1816, melody by Franz Xaver Gruber 1818, first performed Christmas Eve 1818 in Oberndorf near Salzburg with guitar.
Silent Night (2021 film)
Silent Night (2021) is Camille Griffin's British apocalyptic comedy-drama debut, starring Keira Knightley and Matthew Goode at a last Christmas before a toxic climate cloud ends humanity; distinct from Will Thorne's 2021 crime thriller and John Woo's 2023 action film.
Silent Night (2023 film)
Silent Night is a 2023 American action thriller directed by John Woo and starring Joel Kinnaman as a father who, left mute by a gunshot, hunts the gang that killed his son.
Silent Night, Deadly Night
Silent Night, Deadly Night is a 1984 American Christmas horror film directed by Charles E. Sellier Jr. It became highly controversial due to its killer Santa advertising.
Silent Night, Deadly Night (2025 film)
Silent Night, Deadly Night (2025 film), also called the Silent Night Deadly Night reboot, is Mike P. Nelson's Christmas horror remake of the 1984 slasher, starring Rohan Campbell as killer Santa Billy Chapman, released by Cineverse December 12, 2025.
Silent Planet (group)
Silent Planet is a Los Angeles metalcore band formed in 2009, led by vocalist Garrett Russell and known for concept albums whose lyrics carry footnotes on history and theology.
Silent Running
Silent Running (1972) is Douglas Trumbull's directorial debut, a Universal eco-science-fiction film starring Bruce Dern as botanist Freeman Lowell, who preserves Earth's last forests aboard the Valley Forge with robots Huey, Dewey, and Louie.
Silent Sam
Silent Sam: Confederate monument at UNC-Chapel Hill, dedicated 1913, toppled by protesters in August 2018; nickname from the 1950s; Julian Carr's white-supremacist dedication speech and the voided 2019 SCV settlement define its history.
Silent Sejm
The Silent Sejm (Sejm niemy) was a one-day 1717 session of the Polish-Lithuanian parliament where deputies, forbidden to speak, approved a settlement under Russian pressure.
Silent sinus syndrome
Silent sinus syndrome, also called chronic maxillary atelectasis or imploding antrum syndrome, is a rare acquired disorder in which maxillary ostium occlusion creates negative sinus pressure, collapsing the orbital floor and causing painless enophthalmos and hypoglobus, treated mainly with endoscopic sinus surgery.
Silent Spring
Silent Spring (1962) is Rachel Carson's book on the environmental harm of synthetic pesticides, especially DDT. It sparked public concern, the 1963 presidential pesticide report, the EPA's creation in 1970, and the 1972 DDT ban.
Silent treatment
Silent treatment: deliberate withholding of communication to punish, control, or avoid conflict; a dyadic form of ostracism studied by Kipling Williams, linked to pain, stonewalling, and relationship dissolution.
Silent Unseen
Silent Unseen (Cichociemni) were elite Polish exile paratroopers of WWII, trained in Britain by SOE and dropped into occupied Poland, 1941–1944, to support the Home Army; 316 were inserted, and Poland's GROM unit inherits their traditions.
Silent Valley National Park
Silent Valley National Park, Kerala, India: a 237.52 sq km tropical evergreen rainforest in the Nilgiri Hills, saved from a hydroelectric dam by the Save Silent Valley movement, national park since 1984, core of the Nilgiri Biosphere Reserve.
Silent Valley Reservoir
Silent Valley Reservoir is an impounding reservoir in the Mourne Mountains, County Down, Northern Ireland, built between 1923 and 1933 to supply water to Belfast.
Silent Weapons for Quiet Wars (document)
Silent Weapons for Quiet Wars, also called the TM-SW7905.1 manual, is an anonymous conspiracy pamphlet allegedly dated May 1979, popularized by William Cooper's 1991 Behold a Pale Horse; it claims economies can be steered like electrical circuits, but no government provenance or original printing exists.
Silent Witness
Silent Witness is a long-running BBC crime drama created by Nigel McCrery, first broadcast 21 February 1996, following forensic pathologists; 29 seasons and 268 episodes, led in recent series by Emilia Fox as Dr Nikki Alexander.
Silent Zone
Silent Zone is a 2025 post-apocalyptic zombie film directed by Péter Deák, the first produced in Hungary; shot in English, it began US streaming in March 2025 via Saban Films.
Silentó
Silentó, stage name of Richard Lamar "Ricky" Hawk (born 1998), Atlanta rapper whose 2015 debut single "Watch Me (Whip/Nae Nae)" peaked at No. 3 on the Hot 100; in 2025 he received a 30-year manslaughter sentence.
Silenus (Σειληνός)
Silenus (Σειληνός, Seilenos) is the old Greek rustic god of wine-making and drunkenness, foster-father of Dionysus and father of the satyrs; the plural silens names a race of wild, horse-eared hybrid companions of Dionysus, later merged with satyrs.
Silesia
Silesia (Śląsk, Slezsko, Schlesien) is a Central European historical region spanning Poland, Czechia, and Germany, divided by the 1921 Upper Silesian plebiscite, shaped by coal mining and contested Polish, German, Czech, and Silesian identities.
Silesian language
Silesian (ślōnski, ślōnsko godka) is a Slavic variety of Upper Silesia, Poland, spoken at home by 467,000 people (2021 census). Contested between language and dialect of Polish; the Polish Language Council called it a dialect in 2011, and a 2026 regional-language law was passed by parliament then vetoed.
Silesian Parliament
The Silesian Parliament (Sejm Śląski) was the legislature of the autonomous Silesian Voivodeship in interwar Poland, the only regional parliament, functioning from 1922 to 1939.
Silesian Uprisings
The Silesian Uprisings (Powstania śląskie) were three Polish insurrections in Upper Silesia between 1919 and 1921; the third forced a League of Nations partition giving Poland about a third of the province.
Silesian Voivodeship
Silesian Voivodeship (województwo śląskie), Poland's southern province around Katowice: most populous and urbanised region (about 4.2 million people), second-largest regional GDP, and the EU's biggest coal-mining region now undergoing a funded just transition.
Silesian Wars
The Silesian Wars were three wars between Prussia under Frederick II and Habsburg Austria over Silesia: the First (1740–1742), Second (1744–1745), and Third (1756–1763), all won by Prussia, which annexed most of the province.
Siletiteniz
Siletiteniz (Seletyteniz, Силетытениз) is a shallow endorheic salt lake in North Kazakhstan Region, Kazakhstan, about 750–780 km² in area, 2 m mean depth, fed mainly by snowmelt from the Silety River.
SILEX
SILEX (Separation of Isotopes by Laser EXcitation) is a laser-based uranium enrichment technology invented by Silex Systems in the 1990s and commercialized in the United States by Global Laser Enrichment.