All articles starting with O
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Ovarian remnant syndrome
Ovarian remnant syndrome (ORS): residual ovarian tissue left after bilateral salpingo-oophorectomy causing pelvic pain or mass; risk factors endometriosis, PID, adhesions; treated by surgical excision.
Ovarian Reserve
Ovarian reserve, the number of oocytes remaining in the ovaries, is measured with AMH, antral follicle count, and FSH; it predicts IVF oocyte yield well but reproductive potential poorly, and should not be used as a fertility test.
Ovarian stimulation protocol
An ovarian stimulation protocol is a regimen of hormonal medications used in assisted reproduction to develop multiple ovarian follicles before egg retrieval for IVF or ICSI.
Ovarian suppression
Ovarian suppression, also called ovarian function suppression, is a treatment that stops the ovaries from producing estrogen, used to treat hormone-receptor-positive breast cancer in premenopausal women.
Ovarian tissue cryopreservation
Ovarian tissue cryopreservation is a fertility preservation technique that freezes ovarian tissue for later reimplantation, restoring hormones and fertility; more than 300 live births have been reported since 2004.
Ovarian tissue transplantation
Ovarian tissue transplantation is a fertility-preservation procedure in which cryopreserved ovarian cortex is reimplanted to restore ovarian hormone function and fertility, yielding over 300 reported live births.
Ovarian torsion
Ovarian torsion (adnexal torsion): twisting of the ovary around the infundibulopelvic and utero-ovarian ligaments, cutting blood flow; a gynecological emergency treated by laparoscopic detorsion with ovarian preservation, peak age 29–34.
Ovariohysterectomy
Ovariohysterectomy, also called spay or OHE, is surgery that removes both ovaries and the uterus of a female animal, mainly dogs and cats, to sterilize them and prevent reproductive disease.
Ovary
Ovary: paired female gonad producing oocytes and the hormones estrogen and progesterone; almond-sized organs beside the uterus; follicles, ovulation, corpus luteum, menopause, and disorders such as PCOS and ovarian cancer.
Ovation Guitar Company
The Ovation Guitar Company, also known as Ovation Guitars, is an American guitar maker founded by engineer Charles Kaman, known for its rounded composite Roundback acoustic guitars.
Ovation of the Seas
Ovation of the Seas is a Quantum-class cruise ship of Royal Caribbean International, built by Meyer Werft in Germany and delivered in 2016 as the class's third ship.
OVCAR-3
OVCAR-3 (NIH:OVCAR-3, ATCC HTB-161, CVCL_0465) is a human high-grade serous ovarian adenocarcinoma cell line established in 1982 from malignant ascites of a 60-year-old woman; cisplatin-resistant, hormone-receptor positive, NCI-60 member.
OVCAR-5
OVCAR-5 (NIH:OVCAR-5, CVCL_1628) is a human cancer cell line from the ascites of a 67-year-old untreated patient, registered as high-grade ovarian serous adenocarcinoma but suspected of upper gastrointestinal origin; NCI-60 member with homozygous KRAS Gly12Val.
OVCAR-8
OVCAR-8 (NIH:OVCAR-8, CVCL_1629) is a human ovarian cancer cell line from a 64-year-old donor, a member of the NCI-60 panel, TP53-mutant, hyperdiploid, and the only HGSOC line tested that reliably forms ascites in nude mice.
Ovçular Tepesi
Ovçular Tepesi, also written Ovcular Tepesi, is a settlement mound on the Arpaçay stream in Nakhchivan, Azerbaijan, occupied from about 4350 BC and known for the earliest Kura-Araxes artifacts and large copper tools in southwestern Asia.
Ovda Fluctus
Ovda Fluctus, the Festoon Flow, is a 310-km basaltic lava flow complex at 6.1°S, 95.5°E on Ovda Regio, Venus, with arcuate festoon ridges; once thought silica-rich, 2019 Magellan analysis shows basalt.
Ovda Regio
Ovda Regio, Venus' largest crustal plateau in western Aphrodite Terra (10°N–15°S, 50°E–110°E), a 6,000 × 2,500 km tessera highland rising 4–5 km, deformed by ribbons, folds, and graben.
Övdalian
Övdalian, also called Elfdalian (älvdalska in Swedish, övdalsk in the language itself), is a North Germanic variety spoken in Älvdalen, Dalarna, central Sweden, by about 2,000 to 2,500 people.
Ove Christiansen
Ove Christiansen is a quantum chemist and full professor at Aarhus University, known for vibrational coupled cluster theory, the CC3 model, and the MidasCpp program package.
Ove Hoegh‐Guldberg
Ove Hoegh-Guldberg, born 1959 in Sydney, is an Australian marine scientist and Emeritus Professor at the University of Queensland whose 1999 work predicted climate-driven coral reef loss by 2050.
OVEC (Ohio Valley Electric Corporation)
The Ohio Valley Electric Corporation, OVEC, is a utility holding company organized in 1952 to supply power to Atomic Energy Commission uranium enrichment plants near Portsmouth, Ohio.
Oven
An oven is an enclosed heated cavity for cooking food by radiation, convection, and conduction, powered by gas, electricity, or microwaves; types span domestic wall ovens, commercial tunnel ovens up to 100 meters, and FDA-regulated microwave ovens.
Oven-controlled crystal oscillator
An oven-controlled crystal oscillator (OCXO) is a quartz oscillator whose crystal sits in a heated, temperature-regulated enclosure, making it the highest-stability quartz frequency reference for telecom and navigation.
Oveporexton
Oveporexton (TAK-861, brand Orzeyful) is Takeda's oral orexin receptor 2-selective agonist for narcolepsy type 1; FDA approved August 2026 after positive phase 2b and phase 3 trials showing improved wakefulness, sleepiness, and cataplexy.
Over (cricket)
Over (cricket): a set of six legal deliveries bowled by one bowler from one end, governed by MCC Law 17; wides and no-balls do not count. T20 innings are 20 overs, ODIs 50; four balls per over in 1744, six-ball standard worldwide since 1979/80.
Over Bridge
Over Bridge is a single-arch stone bridge over the River Severn at Gloucester, England, built between 1825 and 1830 to a design by Thomas Telford.
Over It (album)
Over It is the 2019 debut studio album by Atlanta R&B singer Summer Walker, an 18-song record of slow-groove, confession-driven R&B that debuted at number two on the Billboard 200.
Over Requiemz
Over Requiemz (オーバーレクイエムズ) is a dark otome visual novel by Kogado Studio and Idea Factory's Otomate brand, released in Japan April 17, 2025 and in English by Aksys Games August 20, 2026, reimagining The Wizard of Oz with death row convicts exploring monster-filled Ruins.
Over Sea, Under Stone
Over Sea, Under Stone (1965) is Susan Cooper's children's fantasy, first book of The Dark Is Rising sequence: the Drew children find a map in a Cornish attic and race the Dark to a grail, guided by Great-Uncle Merry.
Over the Edge (1999)
Over the Edge (1999) was a WWF pay-per-view on May 23, 1999 at Kemper Arena, Kansas City, the second and final Over the Edge event, remembered for Owen Hart's fatal fall during his Blue Blazer entrance and The Undertaker's WWF Championship win over Steve Austin.