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Solenoid valve
A solenoid valve, also called a magnetic valve, is an electrically operated valve controlling liquid or gas flow using an electromagnet that moves a core.
Solenoid-free plasma startup
Solenoid-free plasma startup is starting and ramping up tokamak plasma current without the central solenoid, a key goal for compact spherical tokamaks with little central space.
Solenostomus snuffleupagus
Solenostomus snuffleupagus, the hairy ghost pipefish, is a species of ghost pipefish described in 2026 from the Coral Sea, distinguished by hair-like filaments and 36 vertebrae.
Soleus muscle
Soleus muscle (musculus soleus): broad flat deep calf muscle of the triceps surae, originating from tibia and fibula, inserting via the Achilles tendon; slow-twitch postural plantar flexor, venous pump, and common site of calf strain and DVT.
Solexa
Solexa was a genomics-tools company founded in 1998 in Cambridge, England by chemists Shankar Balasubramanian and David Klenerman, acquired by Illumina in 2007 for about $600 million.
Solexa sequencing
Solexa sequencing is a massively parallel DNA sequencing method that reads clusters base by base by synthesis, and is the core chemistry of Illumina's instruments.
Solfácil
Solfácil is a Brazilian clean-energy fintech founded in 2018 and headquartered in São Paulo that finances rooftop solar systems through a network of installers and sells solar equipment online.
Solfège
Solfège (solfeggio, tonic sol-fa) is the do-re-mi-fa-sol-la-ti syllable system for singing and reading music, created by Guido of Arezzo from Ut queant laxis. It splits into fixed do (do = C, Romance countries) and movable do (do = tonic, Kodály, Curwen hand signs).
SolFocus (company)
SolFocus, Inc. was a concentrating photovoltaic startup founded in 2006 and based in Mountain View, California, which deployed about 18 megawatts of solar projects before winding up in 2013.
Solfrid Koanda
Solfrid Eila Amena Koanda, born 1998 in Oulu, Finland, is a Norwegian weightlifter from Grimstad, Larvik Atletklubb. Olympic 81 kg champion Paris 2024, world total champion 2022 and 2025, four-time European total champion, first Norwegian female Olympic and world weightlifting champion.
Solhan massacre
The Solhan massacre was an overnight attack by armed men on the village of Solhan in northeastern Burkina Faso on 4 to 5 June 2021, killing about 160 civilians.
Solheim Cup
Solheim Cup, biennial women's team match-play golf contest between 12-player US (LPGA) and European (LET) teams, founded 1990 by Karsten Solheim of Ping; 28 points, 14.5 to win; 2026 won 15-13 by Europe in the Netherlands.
Soli Sorabjee
Soli Jehangir Sorabjee (1930–2021), Indian jurist and Senior Advocate, twice Attorney General for India (1989–90, 1998–2004) and Solicitor General (1977–80); champion of free speech, Kesavananda Bharati and Bommai counsel, Padma Vibhushan recipient.
Solibo Magnificent
Solibo Magnificent is a 1988 novel by Martinican writer Patrick Chamoiseau about the death of a Creole storyteller and the failed police investigation that follows.
Solicitation
Solicitation (criminal solicitation, inchoate offense) is asking or inducing another to commit a crime with intent that it be committed; punishable even if the crime never occurs, under common law, MPC §5.02, and 18 U.S.C. §373.
Solicitor
Solicitor: a qualified lawyer admitted to the roll in England and Wales (also used in other common law jurisdictions), regulated by the Solicitors Regulation Authority and represented by the Law Society (founded 1825). Distinct from a barrister; holds reserved activities under the Legal Services Act 2007 and needs an SRA practising certificate.
Solicitor General for Scotland
The Solicitor General for Scotland is one of the two Scottish Law Officers, deputy to the Lord Advocate, a Scottish Government minister under the Scotland Act 1998, dating to 1587; the current holder is BJ Gill KC.
Solicitor General of Barbados
The Solicitor General of Barbados is the senior deputy law officer heading the Solicitor General's Chambers, through which the Attorney-General advises the government, under a 1980 statute.
Solicitor General of India
The Solicitor General of India is the second-ranking law officer of the Government of India, assisting the Attorney General in advising the government and conducting litigation.
Solicitor General of Seychelles
Seychelles has no distinct office of Solicitor General; the Attorney-General, established under Article 76 of the Constitution, fulfills that role, advising the government and prosecuting crimes.
Solicitor General of the Cape Colony
The Solicitor General of the Cape Colony was a Crown law office in the Cape of Good Hope's Law Department, abolished at the creation of the Union of South Africa in 1910.
Solicitor General of the United States
Solicitor General of the United States: the Justice Department officer, created in 1870, who supervises and conducts all US government litigation in the Supreme Court and controls the government's appellate positions; first held by Benjamin Helm Bristow; often called the Tenth Justice.
Solicitor-General for Ireland
The Solicitor-General for Ireland was one of the Crown's law officers in Ireland, deputy to the Attorney-General, advising on Irish legal matters until the office ended in 1924.
Solicitor-General of Australia
Solicitor-General of Australia: the Commonwealth's second law officer and principal government counsel, appearing before the High Court and advising on constitutional law; created under Hughes with Sir Robert Garran; 12th holder Dr Ruth Higgins SC since June 2026.
Solicitor-General of New Zealand
The Solicitor-General of New Zealand is the country's second law officer, a non-political public servant who advises the Crown, supervises prosecutions, and leads the Crown Law Office since 1875.
Solid
A solid is a state of matter in which atoms, ions, or molecules hold fixed positions, giving the material a definite shape; over 90% of solids are crystalline.
SOLID
SOLID is a mnemonic acronym for five object-oriented design principles: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion, assembled by Robert C. Martin in the 1990s and 2000s.
Solid amine sorbents
Solid amine sorbents are porous solids like silica, zeolite, or activated carbon with immobilized amine groups that chemically capture CO2, needing over 50% less regeneration energy than liquid amines.
Solid angle
Solid angle, symbol Ω, measures how large an object appears from a point in three-dimensional space, the 3D counterpart of plane angle, with the SI unit steradian (sr).
Solid Biosciences Inc.
Solid Biosciences Inc., founded in 2013 and traded on Nasdaq as SLDB, is a Massachusetts gene therapy company focused on Duchenne muscular dystrophy and cardiac diseases.