All articles starting with R
22,461 articles
Retailo
Retailo is a B2B e-commerce and digital distribution marketplace headquartered in Riyadh, Saudi Arabia, founded in July 2020 by three former Careem executives to supply small grocery shops and restaurants.
Retained austenite
Retained austenite is austenite in quenched steel that fails to transform to martensite and stays untransformed at room temperature because cooling never reaches the martensite finish temperature.
Retained dental root
Retained dental root (dental root retention), ICD-11 DA0A.3 and ICD-10 K08.3: a root or root fragment left in the jaw after extraction fracture, caries, or trauma; found in about 13% of Finnish adults, most often in the third molar region.
Retained earnings
Retained earnings, also called undistributed profits or plowback, are the cumulative net income a corporation keeps rather than pays as dividends; a negative balance is an accumulated deficit.
Retained medullary cord
Retained medullary cord (RMC, ORPHA:645334) is a rare closed spinal dysraphism in which a non-functional vestigial cord persists below the conus from failed secondary neurulation regression; MRI cannot distinguish it, so intraoperative neurophysiological monitoring is mandatory.
Retainer agreement
Retainer agreement, also called representation agreement: a lawyer-client compensation contract for reserving availability or future services. Covers general, security, and advance fee retainers, trust account rules, and nonrefundable fee limits.
Retaining wall
A retaining wall is a structure built to hold back soil or other material at a difference in elevation, resisting the lateral pressure of the ground behind it.
Retapamulin
Retapamulin, sold as Altabax and Altargo, is a topical pleuromutilin antibiotic developed by GlaxoSmithKline for superficial skin infections like impetigo, the first of its class approved for humans in 2007.
Retard (pejorative)
Retard (pejorative), the R-word: an English slur for people with intellectual disability, derived from Latin retardare "to slow"; noun recorded 1788, slur sense 1970, retired from US federal law by Rosa's Law in 2010.
Retardation effect
The retardation effect is the weakening of van der Waals dispersion forces at large separations, caused by the finite time light takes to travel between interacting atoms or bodies.
Retardation factor
The retardation factor (Rf), also called the retention factor, is a dimensionless ratio in planar chromatography: the distance a solute spot travels divided by the solvent front's distance.
Retarder (mechanical engineering)
A retarder, also known as a brake retarder, is an auxiliary braking device for trucks and buses that dissipates energy as heat without sliding friction, sparing the service brakes.
Retargeting human motion to humanoids
Retargeting human motion to humanoids converts captured human motion into trajectories a humanoid robot with a different body can execute, the first stage in teleoperation and imitation learning.
Retaria
Retaria: marine amoeboid single-celled eukaryotes in Rhizaria, comprising Foraminifera and Radiolaria, united by reticulopodia, with biomineralized skeletons and a fossil record spanning over 500 million years.
Retaspimycin
Retaspimycin (IPI-504) is a water-soluble hydroquinone hydrochloride salt of 17-AAG, an HSP90 inhibitor developed by Infinity Pharmaceuticals for cancer; it reached phase III GIST and phase II NSCLC trials before development was discontinued in 2013.
Retavibart (TNM001)
Retavibart (TNM001, 芮特韦拜单抗, brand Xinduotuo) is Trinomab's long-acting fully human anti-RSV monoclonal antibody targeting the pre-F protein; NMPA approved it in September 2026 for preventing RSV lower respiratory tract infection in infants entering their first RSV season.
Rete algorithm
The Rete algorithm, also called the Rete network, is an efficient pattern-matching algorithm for production rule systems, developed by Charles Forgy at Carnegie Mellon University from 1974.
Rete Ferroviaria Italiana
Rete Ferroviaria Italiana (RFI) is the company of the FS Italiane Group that manages Italy's national railway infrastructure, founded on 1 July 2001 and based in Rome.
Retention basin
A retention basin, also known as a retention pond, wet pond, or stormwater management pond, is a pond that permanently holds water and treats urban stormwater runoff.
Retention election
Retention election: unopposed yes-or-no ballot vote on whether a sitting judge keeps a judicial seat, used in about 19 US states, usually after merit selection; also called the Missouri Plan retention step.
Retention in Care
Retention in care (HIV): continued routine engagement in HIV medical care after linkage, a key care-continuum step. Measured by missed-visit, kept-visit, and WHO ART.5 cohort indicators; US 2024 retention 56%.
Retention index
A retention index is a dimensionless number in gas chromatography that expresses a compound's retention relative to two standard compounds, chiefly the Kováts index, proposed by E. Kováts in 1958.
Retention time prediction
Retention time prediction is a computational method that estimates how long a compound takes to elute from a chromatographic column, used in metabolomics, proteomics, and chromatographic method development.
Retentive Network
Retentive Network (RetNet) is a large language model architecture proposed by Microsoft Research in July 2023, which replaces multi-head self-attention with a retention mechanism supporting parallel, recurrent, and chunkwise computation.
Reteplase
Reteplase (r-PA, Rapilysin) is a nonglycosylated recombinant tPA deletion mutant thrombolytic with kringle-2 and protease domains, given as two 10-unit boluses 30 minutes apart; FDA-approved 1996 for myocardial infarction, EU authorization withdrawn 2024.
Rethabile Khumalo
Rethabile Khumalo, also known as Rethabile or Retha, is a South African singer from Soweto, known for vocals on DJ Zinhle's "Umlilo" (2019) and "Ntyilo Ntyilo" with Master KG (2020).
Rethink Education
Rethink Education is the education-technology venture capital practice of Rethink Capital Partners, founded by Matthew Greenfield in 2012 in White Plains, New York, with roughly $262M raised across four funds.
Rethink Food
Rethink Food: chiefly Rethink Food NYC, Inc., a 501(c)(3) founded 2017 by Matt Jozwiak that pays minority- and women-owned restaurants to prepare rescued meals; also a UK school food nonprofit running the National School Pantry Network.
Rethink Impact
Rethink Impact is a New York-based impact venture capital firm founded by Jenny Abramson in 2015, investing in female and non-binary leaders in health, education, and sustainability.
Rethink Robotics
Rethink Robotics was an American collaborative-robotics company founded in Boston in 2008 by Rodney Brooks, best known for the Baxter and Sawyer factory robots, and closed in 2018.