All articles starting with O
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Obsessed (2009 film)
Obsessed is a 2009 American psychological thriller directed by Steve Shill, starring Idris Elba, Beyoncé Knowles, and Ali Larter as an office temp who stalks him.
Obsessed (Olivia Rodrigo song)
Olivia Rodrigo song "obsessed", released March 22, 2024 as the single from GUTS (spilled); a pop-punk track co-written with Dan Nigro and St. Vincent (Annie Clark) about being obsessed with a boyfriend's ex, formerly a vinyl-only secret track, UK peak No. 10.
Obsessed (인간중독) (2014 film)
Obsessed (인간중독) is a 2014 South Korean erotic melodrama by Kim Dae-woo, set in 1969 during the Vietnam War, starring Song Seung-heon and Im Ji-yeon; it opened first at the box office and passed 1 million admissions in 11 days.
Obsession
Obsession is a word with a psychological meaning, a persistent attachment to an object or idea, and the title of many films, songs, and albums.
Obsession (1976 film)
Obsession (1976) is Brian De Palma's psychological thriller, written with Paul Schrader, starring Cliff Robertson, Geneviève Bujold, and John Lithgow, scored by Bernard Herrmann, and modeled on Hitchcock's Vertigo; released August 1, 1976 by Columbia.
Obsession (2023 TV series)
Obsession is a four-episode 2023 British erotic thriller limited series released on Netflix on April 13, 2023, adapted from Josephine Hart's 1991 novel Damage, about a surgeon's affair with his son's girlfriend.
Obsession (2025 film)
Obsession (2025) is Curry Barker's supernatural horror debut, premiered at TIFF's Midnight Madness, acquired by Focus Features for $15M. Made for $750,000, it grossed over $500M worldwide, starring Michael Johnston and Inde Navarrette.
Obsessive love
Obsessive love, best studied as limerence (coined by Dorothy Tennov, 1979), is involuntary, obsessive, typically unrequited romantic fixation on a 'limerent object', driven by uncertainty, linked to rumination and stalking, and not a DSM-5 diagnosis.
Obsessive–compulsive disorder
Obsessive–compulsive disorder (OCD), a mental disorder of recurring obsessions and compulsions, lifetime prevalence 1–3%, classified in Obsessive-Compulsive and Related Disorders in DSM-5 and ICD-11, treated with ERP and SSRIs.
Obsessive–compulsive personality disorder
Obsessive–compulsive personality disorder (OCPD), also called anankastic personality disorder, is a Cluster C personality disorder marked by perfectionism, orderliness, and control; distinct from OCD, prevalence about 2–8%, treated with psychotherapy and SRIs.
Obshtina Burgas
Obshtina Burgas (Община Бургас), Burgas Municipality, is a Bulgarian municipality in Burgas Province on the Black Sea, centered on the city of Burgas (198,035 people in 2022), led by Mayor Dimitar Nikolov since 2007, with 15 settlements and the Lukoil Neftochim refinery anchoring its economy.
Obshtina Plovdiv
Obshtina Plovdiv (Община Пловдив), Plovdiv Municipality, is a second-order administrative division in southern Bulgaria around the city of Plovdiv; 333,994 residents as of 31.12.2025, six districts, second largest Bulgarian municipality after Stolichna.
Obshtina Varna
Obshtina Varna (Община Варна) is Bulgaria's third-largest municipality, in Varna Province, centered on the city of Varna. 331,260 residents (2025), five urban quarters, five villages, maritime and tourism economy.
Obsidian
Obsidian, also called obsidian rock or dragonglass, is a volcanic glass formed when silica-rich lava cools so fast that crystals cannot form, long prized for razor-sharp tools.
Obsidian Entertainment
Obsidian Entertainment is an American video game developer in Irvine, California, founded in 2003 by former Black Isle Studios staff and known for Fallout: New Vegas and Pillars of Eternity.
Obsolescence
Obsolescence is the state of a product, part, device, or software when it is no longer maintained or required by the user, even if it still works.
Obsolete and proposed metric prefixes
Obsolete and proposed metric prefixes are the former metric prefixes, such as myria- (10^4) and myrio- (10^-4), made obsolete in 1960, and proposals never adopted.
Obsolete CP:0000040
Obsolete CP:0000040 is a deprecated Cell Ontology class identifier using the non-standard CP prefix, proposed for obsoletion in GitHub issue #572 and replaced by the CL identifier for monoblast (CL:0000040).
Obsolete Diptera names
Obsolete Diptera names are family- and genus-group names of flies no longer valid through ICZN suppression, synonymy, or homonymy; about 80,000–85,000 of some 250,000 names are invalid.
Obsolete golf clubs
Obsolete golf clubs: named hickory-era club types (brassie, spoon, cleek, mashie, niblick, jigger) replaced by numbered woods and irons; also the SoHG pre-1935 antique and replica hickory play categories.
Obsolete Hangul jamo
Obsolete Hangul jamo are 15th-century Korean alphabet letters dropped from modern use, notably araea ㆍ, bansiot ㅿ, old ieung ㆁ, and yeorinhieut ㆆ; modern Hangul keeps 24 letters, and old jamo survive in classical texts, Jeju dialect writing, and Unicode old-Hangul encoding.
Obstacle avoidance
Obstacle avoidance is a mobile robot's ability, seen most in robotic vacuums, to detect small objects like cables and pet waste and steer around them before contact.
Obstacle problem
The obstacle problem is a constrained variational problem in partial differential equations, modeling an elastic membrane resting on an obstacle, the prototype of free boundary problems.
Obstacle-aided locomotion
Obstacle-aided locomotion is a snake robot propulsion strategy in which external objects such as walls, rocks, and rubble serve as push-points for forward motion, a term introduced by Transeth and colleagues.
Obstetric embolism
Obstetric embolism is the blockage of a maternal blood vessel by a clot, air, fat, amniotic fluid, or infected material during pregnancy, childbirth, or the puerperium.
Obstetric fistula
Obstetric fistula, or vesicovaginal and rectovaginal fistula from obstructed labour, is a childbirth tear causing incontinence; 50,000-100,000 new cases yearly, treatable by surgery, preventable with obstetric care.
Obstetric laceration of cervix
Obstetric laceration of cervix (cervical tear from childbirth; ICD-11 JB0A.3, ICD-10 O71.3): a tear of the cervix during labor or delivery, causing postpartum hemorrhage; risk factors include forceps delivery, cerclage, nulliparity, and induction.
Obstetric Surgical Procedures
Obstetric surgical procedures are operations performed on a pregnant woman for conditions of pregnancy, labor, or the puerperium, ranging from cesarean section, the most frequent major abdominal surgery worldwide, to cervical cerclage.
Obstetric ultrasonography
Obstetric ultrasonography (prenatal ultrasound, fetal sonography) images the fetus and uterus with sound waves, not radiation. Key uses: CRL dating at 8–14 weeks, biometry (BPD, HC, AC, FL), anomaly screening, Doppler, 3D/4D imaging.
Obstetrical Analgesia
Obstetrical analgesia (obstetric analgesia) is pain relief without loss of consciousness during labor, delivery, or the postpartum period. Main methods: epidural and combined spinal-epidural blocks, parenteral opioids, nitrous oxide; epidural gives the strongest pain relief with trade-offs in hypotension, fever, and assisted birth.