All articles starting with O
9,097 articles
Oral rehydration therapy
Oral rehydration therapy (ORT), using oral rehydration salts (ORS) solution, treats diarrhoeal dehydration by mouth via glucose-sodium absorption; WHO low-osmolarity formula (75 mEq/L sodium, 75 mmol/L glucose) since 2003, credited with saving about a million children yearly.
Oral Roberts
Oral Roberts was an American Pentecostal healing evangelist and televangelist who founded Oral Roberts University in 1963 and taught the seed-faith message of giving and receiving.
Oral Roberts University
Oral Roberts University (ORU) is a private Christian interdenominational university in Tulsa, Oklahoma, founded by evangelist Oral Roberts, chartered in 1963, offering whole-person education, 16 NCAA Division I teams, and 17 straight years of enrollment growth.
Oral sex
Oral sex, mouth-to-genital stimulation (fellatio, cunnilingus, anilingus), is practiced by over 85% of US sexually active adults. It transmits many STIs including gonorrhea, syphilis, and HPV (linked to 60-70% of oropharyngeal cancers), while HIV risk is much lower than from anal or vaginal sex.
ORAL STRATEGY trial
ORAL Strategy (Oral Rheumatoid Arthritis triaL Strategy), NCT02187055: a 2017 Pfizer-funded phase 3b/4 head-to-head trial in 1146 methotrexate-inadequate responders showing tofacitinib plus methotrexate non-inferior to adalimumab plus methotrexate; tofacitinib monotherapy was not.
Oral submucous fibrosis
Oral submucous fibrosis (OSF, OSMF): chronic potentially malignant fibrosis of the oral mucosa caused by areca (betel) nut chewing, causing trismus and burning, with 3-10% oral cancer risk.
Oral surgery, oral medicine, oral pathology and oral radiology
Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology (OOOO) is a monthly Elsevier peer-reviewed dental journal, ISSN 2212-4403, started 2012, continuing the 1948-founded Triple O title, official publication of four American oral specialty academies.
Oral Surgical Procedures
Oral surgical procedures (MeSH D019647) are operations inside the mouth and maxillofacial region: extractions, third molar surgery, implants, bone and gum grafts, orthognathic and preprosthetic surgery, distinguished from broader maxillofacial surgery.
Oral Torah (תורה שבעל פה)
The Oral Torah (תורה שבעל פה, Torah she-be'al peh) is, in Rabbinic Judaism, the body of oral law tradition holds God gave Moses at Sinai alongside the Written Torah.
Oral tradition
Oral tradition: the word-of-mouth transmission of songs, tales, myths, proverbs, and genealogies across generations, also called orality. Covers genres, Parry-Lord formulaic composition, Vansina's historical method, and UNESCO safeguarding.
Oral trivalent reassortant rotavirus live attenuated vaccine (Vero cell), LLR3
LLR3 (Reassortant Rotavirus Vaccine, Live, Oral, Trivalent, Vero Cell) is a Chinese human-lamb reassortant rotavirus vaccine covering G2, G3, G4, licensed April 2023 by Lanzhou Institute of Biological Products, with 56.6% efficacy against any-severity rotavirus gastroenteritis.
Oral-B
Oral-B is an oral care brand owned by Procter & Gamble, founded in 1949 by a California periodontist, acquired by Gillette in 1984, and known for its oscillating-rotating electric toothbrushes.
Oral, Kazakhstan
Oral (Uralsk, formerly Yaitsky gorodok), city on the Ural River at the Chagan confluence in northwestern Kazakhstan, center of West Kazakhstan Region; founded 1613 by Yaik Cossacks, renamed 1775 after Pugachev's revolt; population about 234,000.
ORAL1069 trial
ORAL1069 (Pfizer protocol A3921069), also called ORAL Start, is a 24-month phase 3 trial (NCT01039688) showing tofacitinib monotherapy superior to methotrexate in methotrexate-naïve rheumatoid arthritis, with higher zoster and cancer rates.
Órale
Órale is a Mexican Spanish interjection from ora (short for ahora) plus the enclitic -le, expressing agreement, encouragement, surprise, or interruption; also used in Guatemala, Honduras, and El Salvador, first recorded in 1562.
Oralloy
Oralloy, from "Oak Ridge alloy," is a Manhattan Project code name for uranium enriched to about 93.5 percent uranium-235, the fuel of the Little Boy bomb dropped on Hiroshima.
Oralman
An oralman (Kazakh: оралман, from "to return") was the official legal status of ethnic Kazakhs who immigrated to Kazakhstan for permanent residence after independence in 1991.
Oram's Arbour
Oram's Arbour is a large Iron Age enclosed settlement, or oppidum, at Winchester in Hampshire, largely abandoned before the Roman town of Venta Belgarum was founded.
Oran (وَهْرَان)
Oran (وهران) is Algeria's second-largest city, a western Mediterranean port captured by Spain in 1509, held until 1792, taken by France in 1831, and the birthplace of raï music.
Oran massacre of 1962
The Oran massacre of 1962 was the killing of several hundred European residents of Oran, Algeria, on 5 July 1962, the day Algerian independence was celebrated.
Oran Province
Oran Province (ولاية وهران, Wilaya d'Oran) is Algeria's wilaya no. 31 in the northwest, capital Oran city; 2,114 km², 26 communes, second commercial port, Arzew oil port, raï music birthplace.
Orana gas field
Orana is a coal seam gas field in the Surat Basin of southern Queensland, producing gas from the Walloon Coal Measures as part of the Australia Pacific LNG project.
Oranda
The oranda, also known as the Oranda goldfish (高头), is a fancy goldfish variety with a raspberry-like head growth called the wen and a long, flowing double tail.
Orang Asli
Orang Asli ("original people" in Malay) are the indigenous peoples of Peninsular Malaysia: 18 subgroups in the Negrito, Senoi, and Proto-Malay groups, about 227,900 people in 2025, governed by the Aboriginal Peoples Act 1954 with common-law customary land rights.
Orang Ikan
Orang Ikan (aka Monster Island) is a 2024 creature horror film directed by Mike Wiluan, a Singapore-Indonesia-Japan-UK co-production in which a Japanese soldier and a British POW stranded in 1942 are hunted by a fish-man of Malay folklore.
Orang Laut
Orang Laut, Malay for "sea people," are boat-dwelling maritime communities of the Thai-Malay Peninsula and Sumatra, historically pillars of the Srivijaya, Melaka, and Johor-Riau kingdoms.
Orang Pendek
Orang Pendek ('short person'), also called sedapa, is an unconfirmed short upright ape reported in Sumatra's Kerinci Seblat region since Dutch colonial times; Sykes's 2014 DNA test of a hair sample matched Malayan tapir.
Orange
Orange is the color between yellow and red on the visible spectrum, produced by light with wavelengths of roughly 590 to 620 nanometers. The name comes from the fruit.
Orange (2010 film)
Orange (ఆరెంజ్), 2010 Telugu romantic comedy-drama directed by Bhaskar, starring Ram Charan and Genelia D'Souza, music by Harris Jayaraj; a 2010 box office failure that later gained cult status through re-releases.
Orange (2015 film)
Orange (オレンジ), 2015 Japanese live-action film by Hashimoto Kojiro for Toho, adapting Ichigo Takano's manga; stars Tao Tsuchiya and Kento Yamazaki; distinct from the 2010 Telugu film Orange.