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Thoracotomy
Thoracotomy: open chest surgery cutting between the ribs to reach lungs or other thoracic organs. Approaches include posterolateral and clamshell; main risks are pain, infection, bleeding, and post-thoracotomy pain syndrome.
Thorad SLV-2G Agena D
Thorad SLV-2G Agena D was an American two-stage expendable launch vehicle flown by the US Air Force from Vandenberg, chiefly for Corona reconnaissance satellites, from 1966 to 1972.
Thoralf Glad
Thoralf Johan Glad (1878–1969), Norwegian sailor and KNS Oslo member; helmsman of Taifun, gold medalist in the 8 metres class at the 1912 Stockholm Olympics, winning both races.
Thoralf M. Sundt Jr
Thoralf M. Sundt Jr. (1930–1992) was an American neurosurgeon who chaired the Department of Neurologic Surgery at the Mayo Clinic and developed techniques and instruments for giant intracranial aneurysms.
Thoralf Skolem
Thoralf Skolem (1887–1963) was a Norwegian mathematician and logician regarded as a founding father of model theory, known for the Löwenheim–Skolem theorem and the Skolem paradox.
Thorarchaeota
Thorarchaeota (class Thorarchaeia) is a Candidatus phylum of Asgard archaea from sediments, named after Thor. Its genomes encode eukaryotic membrane-trafficking homologues (Sec23/24, TRAPP) and suggest a mixotrophic, acetogenic, sulfur-reducing lifestyle.
Thorarchaeota and the eukaryotic origins debate
Thorarchaeota are a lineage of Asgard archaea, defined in 2017, whose genomes uniquely encode eukaryotic membrane-trafficking and vesicle-biogenesis proteins, making them central evidence in the debate over whether eukaryotes evolved from within archaea.
Thorax
Thorax: the body region between neck and abdomen, enclosed by the rib cage (12 rib pairs, sternum, 12 thoracic vertebrae), containing heart and lungs in mediastinum and pleural cavities; key breathing and trauma anatomy.
Thordarhyrna
Thordarhyrna (Þórðarhyrna) is a subglacial stratovolcano beneath Vatnajökull, Iceland, the second central volcano of the Grímsvötn-Laki system, 20 km SW of Grímsvötn, 1,650 m high, last erupting in 1903–1904 (VEI 4).
Thordis Brandt
Thordis Brandt (Thordis I. Brandt, 1940–2015), German-born American actress and registered nurse, "actor's nurse" to Patricia Neal; bit parts in Funny Girl, Spinout, In Like Flint, and lead in The Witchmaker (1969).
Thorfinn Karlsefni
Thorfinn Karlsefni (Þórfinnr Karlsefni, born Thorfinn Thordarson, c. 980–95 CE), Icelandic merchant who led a Vinland colonization attempt (c. 1004–1020, three ships) with Gudrid; son Snorri, first European born in North America.
Thorgan Hazard
Thorgan Hazard (Thorgan Ganael Francis Hazard), Belgian footballer born 1993 in La Louvière, brother of Eden; 47 caps, 9 goals; Gladbach and Dortmund winger-attacker, 2023–2026 at Anderlecht, RC Lens from 2026.
Thorgils Sprakelegg
Thorgils Sprakelegg (Þórgísl Sprakalegg, Torgils Sprakalägg), Danish magnate or jarl of Sweyn Forkbeard's time, father of Ulf Jarl and ancestor of the Danish royal line 1047–1412 and of Gytha of Wessex.
Thorikos
Thorikos (Thorikó), ancient Attic deme on the Velatouri Hill in southeast Attica, Greece; a silver-mining town of the Laurion district with Mycenaean tholos tombs, one of Greece's oldest theatres, and Belgian-led excavations since 1960.
Thorill Gylder
Thorill Gylder (born 1958), Norwegian race walker, Norway's leading woman in the sport 1975–1981; 13 national titles, world records at 5000 m track (23:17.5, Bislett 1978) and 20 km road (1:43:20), 1979 world championship bronze.
Thorin Oakenshield
Thorin Oakenshield (Thorin II) is the dwarf leader of Tolkien's The Hobbit, son of Thráin II, King under the Mountain, who leads the Quest of Erebor against Smaug and dies at the Battle of Five Armies.
Thorium
Thorium is a weakly radioactive silvery metallic element of the actinide series, atomic number 90, whose isotope thorium-232 can be bred into fissile uranium-233 for nuclear fuel.
Thorium decahydride
Thorium decahydride (ThH10) is a hydrogen-rich thorium compound, synthesized above about 85 GPa, that is a conventional high-temperature superconductor with a critical temperature of 159 to 161 K.
Thorium fuel cycle
The thorium fuel cycle is a nuclear fuel cycle that breeds fissile uranium-233 from abundant fertile thorium-232, proposed as an alternative to the uranium–plutonium cycle but never commercialized.
Thorium molten-salt reactor (China)
China's 2 MWt thorium molten-salt reactor program, led by the Shanghai Institute of Applied Physics, operates TMSR-LF1 at Wuwei, Gansu, first to convert thorium to uranium.
Thorium monoxide
Thorium monoxide (ThO) is a heavy polar diatomic molecule of thorium and oxygen, best known as the working molecule of the ACME electron electric dipole moment searches.
Thorium superhydride
Thorium superhydride refers to hydrogen-rich thorium compounds, chiefly ThH₉ and ThH₁₀, that become superconducting at high temperature when compressed to pressures of roughly 100 to 175 GPa.
Thorium-229m
Thorium-229m is the isomeric excited state of thorium-229, at about 8.4 eV the lowest known nuclear excitation, and the basis of the first nuclear clocks demonstrated in 2026.
Thorium-229m isomer
Thorium-229m is the isomeric first excited state of the thorium-229 nucleus, lying only about 8 eV above the ground state and proposed as the basis for a nuclear clock.
Thorium-230
Thorium-230, historically called ionium, is a radioactive thorium isotope with a half-life of about 75,000 years that forms in the uranium-234 decay chain and underpins uranium–thorium dating.
Thorium-232
Thorium-232 (²³²Th) is the most abundant naturally occurring isotope of thorium, an alpha emitter with a half-life of about 14 billion years that heads the thorium decay series.
Thorium-based nuclear power
Thorium-based nuclear power uses fertile thorium-232 as the principal fuel, converting it into fissile uranium-233 through neutron irradiation; it works in light water and molten salt reactors.
Thorius
Thorius (pigmy salamanders, Mexican pigmy salamanders) is a genus of 29 minute lungless salamander species endemic to southern Mexico, among the smallest tetrapods, noted for skeletal novelty and extreme endangerment.
Thorkell the Tall
Thorkell the Tall (Þorkell inn hávi), Danish viking leader, earl of East Anglia and regent under Cnut; ravaged England 1009–1012, served Æthelred from 1012, given East Anglia in 1017, vanishes after 1023.
Thorkild Bjørnvig
Thorkild Bjørnvig (1918–2004) was a Danish poet, essayist, and literary scholar who co-edited the influential postwar journal Heretica, translated Rilke, and became widely known for his 1970s environmental poetry.