All articles starting with O
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Otoscopes
Otoscopes (auriscopes) are hand-held instruments with a light, ear speculum, and magnifying lens for examining the ear canal and tympanic membrane; first integrated by Bruton in 1862, class I FDA-exempt, with pneumatic and digital telemedicine variants.
Otoscopy
Otoscopy is a clinical examination using an otoscope, combining light, speculum, and magnifying lens, to inspect the ear canal and tympanic membrane and diagnose ear conditions.
Otospiralin
Otospiralin (OTOS/OTOSP) is a 6.4 kDa secreted inner ear protein made by cochlear and vestibular fibrocytes; its loss causes fibrocyte degeneration and deafness in mice and guinea pigs.
Ototoxic hearing loss
Ototoxic hearing loss: irreversible sensorineural hearing loss from ototoxic drugs (aminoglycosides, cisplatin, loop diuretics, salicylates) or workplace chemicals (solvents, lead, carbon monoxide), detected by baseline and serial high-frequency audiometry.
Ototoxicity
Ototoxicity is drug- or chemical-induced inner ear damage causing hearing or balance loss, chiefly from aminoglycoside antibiotics and platinum chemotherapy such as cisplatin, with pooled prevalence near 43%.
Otovo
Otovo is a Norwegian-founded marketplace for residential solar, founded in Oslo in 2016, that connects homeowners with local installers for solar panels, batteries, and heat pumps.
Otoya Yamaguchi (山口二矢)
Otoya Yamaguchi (山口二矢) was a 17-year-old Japanese ultranationalist who assassinated Japan Socialist Party chairman Inejirō Asanuma on live television at Hibiya Hall on 12 October 1960, then hanged himself in custody on 2 November 1960.
Otozō Yamada (山田乙三)
Otozō Yamada (山田乙三, 1881–1965), Japanese cavalry general and last commander of the Kwantung Army (1944–45); convicted at the 1949 Khabarovsk bacteriological warfare trial, sentenced to 25 years, released 1956.
OTP Bank
OTP Bank, also known as OTP Group, is a Hungarian banking group that grew out of the 1949 state savings monopoly and now serves over 17 million clients in 11 countries.
OTR Therapeutics
OTR Therapeutics (翱路医药) is a Shanghai-based biotechnology startup founded in March 2025 that raised a $100 million Series A to build oncology and immunology drugs.
OTR-21 Tochka
OTR-21 Tochka (Точка, 9K79, NATO SS-21 Scarab), Soviet solid-fuel divisional short-range ballistic missile from Kolomna, in service 1975; Tochka-U reaches 120 km with 482 kg warhead; retired by Russia for Iskander-M, still used by Ukraine and others.
Otrar incident
The Otrar incident (حادثة أوترار) was the killing of a merchant caravan sent by Genghis Khan to Otrar in 1218, leading to the Mongol invasion of Khwarazm.
Otrar massacre
The Otrar massacre (واقعه اترار) was the killing of a Mongol trade caravan at Otrar in 1218, the stated cause of Genghis Khan's invasion of the Khwarazmian Empire.
Otras inquisiciones
Otras inquisiciones is a 1952 collection of thirty-nine essays by the Argentine writer Jorge Luis Borges, published by the journal Sur and ranging over literary criticism, history, language, religion, and metaphysics.
Otrovert
Otrovert, a term coined by psychiatrist Rami Kaminski in The Gift of Not Belonging, describes people who feel like outsiders in any group despite being popular and socially comfortable one-on-one; it is not a peer-reviewed personality category.
Otrus
Otrus, also spelled Otrous, was a city of Roman Phrygia in Asia Minor, one of the five Phrygian Pentapolis cities, later a bishopric in Phrygia Salutaris and identified with Tchor Hissar.
OTs-14 Groza
The OTs-14 Groza (ОЦ-14 «Гроза", "Thunderstorm") is a Russian bullpup, modular assault rifle in 9x39mm, developed at TsKIB SOO in Tula and used by OMON, SOBR, and Spetsnaz units, including in Chechnya.
Otsego Lake (New York)
Otsego Lake is a deep glacial lake in Otsego County, New York, directly north of Cooperstown and the source of the Susquehanna River; James Fenimore Cooper called it "Glimmerglass."
OTST study
OTST study: the International Ovarian and Testicular Stromal Tumor Registry (NCT01970696), a 2011 observational study of rare gonadal stromal tumors and DICER1 mutations; also the Oslo Tomosynthesis Screening Trial.
Ōtsu
Ōtsu (大津市) is the prefectural capital of Shiga Prefecture, Japan, a core city on Lake Biwa near Kyoto with about 342,700 residents; it was Japan's capital 667–672 and part of the UNESCO Ancient Kyoto site.
Ōtsu Incident
The Ōtsu Incident (大津事件, also called the Kōnan Incident) was the 1891 attempted assassination of Russian crown prince Nicholas II in Ōtsu, Japan, by policeman Tsuda Sanzō.
Otsu's method
Otsu's method, also called Otsu's algorithm, is an automatic image thresholding technique in image segmentation that Nobuyuki Otsu published in 1979, choosing the threshold that best separates two pixel classes.
Otsuka Corporation
Otsuka Corporation (大塚商会) is a Japanese IT services company founded in Tokyo in 1961 that sells and supports office IT for small and mid-sized businesses.
Otsuka Holding
Otsuka Holdings Co., Ltd. (大塚ホールディングス) is a Japanese pure holding company created in 2008 to oversee the Otsuka group, including Otsuka Pharmaceutical and Taiho Pharmaceutical.
Otsuka Pharmaceutical
Otsuka Pharmaceutical (大塚製薬) is a Japanese pharmaceutical and nutraceutical company headquartered in Tokyo and established in 1964, known for the antipsychotic ABILIFY and the beverage POCARI SWEAT.
Ōtsuki Gentaku
Ōtsuki Gentaku (大槻玄沢, 1757–1827) was a Japanese physician and Rangaku scholar of the late Edo period who founded the Shirandō academy and wrote the Dutch-studies textbook Rangaku Kaitei.
Ott & The All-Seeing I
Ott & The All-Seeing I is a four-piece live band formed around 2011 by British psychedelic dub producer Ott, with Chris Barker, Matt White, and Nick Holden.
Ott-Heinrich Keller
Ott-Heinrich Keller (1906–1990) was a German mathematician who posed Keller's conjecture on tilings of space by cubes in 1930, and held the chair of mathematics at Halle-Wittenberg from 1951 to 1971.
Otta seal
An Otta seal is a thin bituminous surface treatment for low-volume roads, developed by Norwegian road authorities in 1963, that uses soft binder and inexpensive graded aggregate.
Ottakoothar
Ottakoothar (ஒட்டக்கூத்தர்) was a 12th-century Tamil court poet and teacher who served three successive Chola kings, Vikrama Chola, Kulottunga Chola II, and Rajaraja II, and whose Muvarula and Thakkayagapparani shaped medieval Tamil court poetry.