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Sinus rhythm
Sinus rhythm is the normal heart rhythm initiated by the sinoatrial node, the heart's natural pacemaker, at a rate of 60 to 100 beats per minute.
Sinus Roris
Sinus Roris ("Bay of Dew") is a 195-km lunar sinus, a small basalt bay on the Moon's northern nearside between Oceanus Procellarum and Mare Frigoris, IAU-named in 1935 with olivine-rich young basalts.
Sinus Successus
Sinus Successus ("Bay of Success") is one of the Moon's twelve named sinūs, a 126.65 km basaltic bay at 1.12°N, 58.52°E near Mare Fecunditatis, IAU-approved in 1979, near the Luna 16 and 20 landing sites.
Sinus tachycardia
Sinus tachycardia: a regular heart rhythm from the sinoatrial node at over 100 bpm, usually an appropriate response to exercise, fever, or stress; also covers inappropriate sinus tachycardia (IST), a diagnosis of exclusion defined by resting HR >100 bpm.
SINUS-24 trial
SINUS-24 (LIBERTY NP SINUS-24, NCT02912468): phase 3 trial of dupilumab 300 mg every 2 weeks versus placebo for 24 weeks in 276 adults with severe CRSwNP; significantly improved nasal polyp score and congestion.
SINUS-52 trial
SINUS-52 (LIBERTY NP SINUS-52, NCT02898454), a 52-week phase 3 trial of dupilumab 300 mg in 448 adults with severe CRSwNP, met co-primary nasal polyp score and congestion endpoints versus placebo.
Sinusitis
Sinusitis (rhinosinusitis) is inflammation of the sinus lining, usually viral. Key facts: acute under 4 weeks, chronic over 12 weeks; ABRS diagnosed at 10 days without improvement or double worsening; amoxicillin 5-7 days first line.
Sinusoidal pulse-width modulation
Sinusoidal pulse-width modulation is a modulation technique that controls a DC-AC inverter by comparing a sinusoidal reference with a high-frequency triangular carrier, reducing output harmonics.
Sinusotomy
Sinusotomy is the surgical opening of a paranasal sinus, such as the maxillary, ethmoid, frontal, or sphenoid, now usually done endoscopically to restore drainage and ventilation in chronic rhinosinusitis.
Sinyu Persecution
The Sinyu Persecution (신유박해) was a large-scale 1801 suppression of Roman Catholics in Joseon Korea, ordered by Queen Dowager Jeongsun and killing about 100 believers.
Siobhan
Siobhan (Irish: Siobhán) is a feminine given name meaning "God is gracious", the Irish form of Jehanne/Jeanne brought to Ireland by the Anglo-Normans; peaked at #15 in Ireland in 1971, now rare, with 9,193 Irish bearers.
Siobhan Brady
Siobhan Brady is a plant biologist and professor at the University of California, Davis, known for mapping gene regulatory networks that control root cell development, and an HHMI Investigator since 2024.
Siobhán Donaghy
Siobhán Donaghy (born 1984, London) is a British pop singer, founding member of Sugababes ('Overload'), solo artist of Revolution in Me (2003) and Ghosts (2007), later reunited with the original line-up.
Siobhan Fahey
Siobhan Fahey (born 1958, Dublin), Irish singer, founding member of Bananarama (44 UK hits, US No. 1 "Venus") who left in 1988 to form Shakespears Sister, whose "Stay" spent eight weeks at UK No. 1; reunited with Marcella Detroit in 2019.
Siobhan Fallon Hogan
Siobhan Fallon Hogan (born 1961, Syracuse, New York) is an American character actress and comedian, an SNL 1991-92 cast member, Seinfeld's Tina, and star of Forrest Gump, Men in Black, and three Lars von Trier films; she wrote and produced Rushed (2021) and Shelter in Solitude (2023).
Siobhan Finneran
Siobhan Finneran (born 1966, Oldham) is an English actress known for Rita, Sue and Bob Too, Benidorm, Downton Abbey's Sarah O'Brien, Happy Valley's Clare Cartwright, and her first lead role in ITV's Protection.
Siobhan Haughey
Siobhan Haughey (Siobhán Bernadette Haughey, 詩蓓•何), Hong Kong swimmer born 1997; four Olympic medals (Tokyo 2020 silvers, Paris 2024 bronzes in 100m/200m freestyle), 200m short-course world record 1:50.31, Doha 2024 world champion.
Siobhán McSweeney
Siobhán McSweeney (Siobhán Nic Suibhne, born 1979) is an Irish actress from County Cork known for Sister Michael in Derry Girls (BAFTA 2023), hosting The Great Pottery Throw Down and The Traitors Ireland.
Siobhan Redmond
Siobhan Redmond (born 1959, Glasgow) is a Scottish actor and RSC Associate Artist known for DS Maureen Connell in Between the Lines, Shona Spurtle in The High Life, and stage roles from Mary Stuart to Happy Days; not to be confused with games executive Siobhan Reddy.
Siobhan Williams
Siobhan Williams is a British-born Canadian actress and musician (artist name SIØBHAN) known for Hell on Wheels, Black Box, UnREAL, Deadly Class, and as Laura Kearney in The Quarry (2022), which earned a BAFTA nomination.
Siofok
Siófok, a Lake Balaton town in Hungary, and its football club BFC Siófok (Siófoki Bányász SE), founded 1921, Hungarian Cup winner 1984, NB I fourth place 1991–92, now in NB III.
Siôn Daniel Young
Siôn Daniel Young (born 1989, Cardiff) is a Welsh actor, fluent in Welsh, trained at the Royal Conservatoire of Scotland; known for Lost Boys and Fairies (BAFTA Cymru Best Actor 2025), Deceit, Slow Horses, and War Horse.
Sion James
Sion James (born 2002) is an American NBA guard-forward for the Charlotte Hornets, drafted 33rd overall in 2025 after four seasons at Tulane and one at Duke, known for defense and improved three-point shooting.
Sion Oppong
Sion Oppong (Sion Uno Kobi Oppong), Swedish left winger born 2007; IF Brommapojkarna graduate, 2026 Allsvenskan 14 apps 2 goals, sold to Toulouse FC in August 2026 for 40 million SEK.
Sion Power
Sion Power Corporation is a privately held battery developer in Tucson, Arizona, founded in 1989, that makes Licerion lithium-metal cells, now aimed mainly at defense and aerospace.
Sion Sono (園 子温)
Sion Sono (園 子温) is a Japanese filmmaker born in 1961 in Toyokawa, known for Suicide Circle and Love Exposure, which won awards at the Berlin Film Festival.
Sion Treasure
The Sion Treasure is a hoard of 57 sixth-century Byzantine silver liturgical vessels found illegally in 1963 near Kumluca, Turkey, and now split across five collections.
Sion, Switzerland
Sion (Sitten) is the capital of Valais canton, Switzerland, in the sunny Rhone Valley. Settled since around 6200 BC, it is known for the Valere and Tourbillon castle hills, its old town, vineyards, airport, and about 37,800 residents.
Sionascaig Lacus
Sionascaig Lacus, named for Loch Sionascaig, Scotland, is a 143-km candidate hydrocarbon lake at 41.5S on Titan, identified in Cassini VIMS T66 data as a rare temperate-latitude lake.
Sioni
FC Sioni Bolnisi (სკ სიონი ბოლნისი), founded 1936 in Bolnisi, Georgia, is a football club in Erovnuli Liga 2, Georgian champion 2005/06, playing at Bolnisi Central Stadium.