Search by letter: R
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Search by letter: R
- Retrograde amnesia: causes, features, diagnosis and recovery Retrograde amnesia
- Retrograde and Direct Motion in Astronomy Retrograde and direct motion
- Retrovirus
- Retschwil — former municipality in Lucerne, Switzerland Retschwil
- Rett syndrome
- Rettenberg (Bavaria) — municipality in Oberallgäu, Germany Rettenberg
- Rettendon, Essex Rettendon
- Return of Saturn — No Doubt album (2000) Return of Saturn
- Return of the Texan (1952) — American Western film Return of the Texan
- Return statement (programming) Return statement
- Return to Base — Slade (1979 album) Return to Base
- Return to Castle Wolfenstein
- Return to Never Land (2002 film) Return to Never Land
- Return to Oz (1985 film) Return to Oz
- Return to the Blue Lagoon (1991 film) Return to the Blue Lagoon
- Returns (economics) — Payments to factors of production Returns (economics)
- Rety — commune in Pas-de-Calais, northern France Rety
- Retzwiller: Commune in Haut-Rhin, Alsace, France Retzwiller
- Reuben (son of Jacob) Reuben
- Reuben Hersh: mathematician and writer on the nature of mathematics Reuben Hersh
- Reuben sandwich
- Reubens, Idaho
- Reubin Askew
- Reugny (Allier) — commune in central France Reugny, Allier
- Reuilly-Sauvigny — small commune in Aisne, northern France Reuilly-Sauvigny
- Reunion (gathering) and Réunion (island) Reunion
- Réunion (French island, region and overseas department) Réunion
- Réunion national football team
- Reus, Catalonia: city profile, history and cultural highlights Reus
- Reuss (river) — Swiss river flowing from the Alps to the Aare Reuss (river)
- Reute (Appenzell Ausserrhoden, Switzerland) Reute
- Reuters
- Reuthe, Vorarlberg: Alpine municipality in the Bregenzerwald Reuthe
- Reutigen: Swiss municipality in the district of Thun, canton of Bern Reutigen
- Reutlingen — German city in Baden-Württemberg Reutlingen
- Reutlingen (district) — Landkreis in Baden-Württemberg Reutlingen (district)
- Reutte, Tyrol: Market town and district center in Austria Reutte
- Reutte District (Außerfern) — geography, history and highlights Reutte District
- Reuven Feuerstein — psychologist and developer of cognitive modifiability theory Reuven Feuerstein
- Reuven Hammer: Conservative rabbi, liturgy scholar and Masorti leader Reuven Hammer
- Reuven Rivlin
- Reux (Calvados) — commune in Normandy, France Reux
- Revaz (Rezo) Chkheidze — Georgian film director and cultural figure Revaz Chkheidze
- Revelation: Divine Disclosure and the New Testament Book Revelation
- Revelstoke, British Columbia: mountain town, rail history, and outdoor recreation Revelstoke, British Columbia
- Revenge: motives, forms, history, and social effects Revenge
- Revenge (Kiss album) Revenge (album)
- Revenge (American TV series) Revenge (TV series)
- Revenge of the Nerds (1984 film) Revenge of the Nerds
- Revenge porn (non-consensual distribution of intimate images) Revenge porn
- Revenue: definition, types, measurement and role in finance Revenue
- Reverberation: acoustic persistence of sound in enclosed spaces Reverberation
- Revere, Massachusetts: coastal city near Boston Revere, Massachusetts
- Reverend Timothy Lovejoy (The Simpsons) Reverend Lovejoy
- Reverolle, Vaud — Swiss municipality Reverolle
- Reversal of Fortune (1990 film) Reversal of Fortune
- Reverse DNS lookup (rDNS): PTR records, reverse zones, and common uses Reverse DNS lookup
- Reverse osmosis: principles, components, uses, and limitations Reverse osmosis
- Reverse transcriptase
- Reverse-Flash
- Revest-les-Roches
- Reviers: a commune in Calvados, Normandy (northwestern France) Reviers
- Review (evaluation): types, purposes, formats, and influence Review
- Révillon — former commune in Aisne, Hauts‑de‑France Révillon
- Revised Romanization of Korean
- Revival (renewal in religion, arts, culture, and economy) Revival
- Revival meeting
- Revivor — eighth studio album by Funker Vogt Revivor
- Revolt of the Zombies (1938 film) Revolt of the Zombies
- Revolution: sudden social, political, and technological change Revolution
- Revolution Studios
- Revolutions of 1848 (Spring of Nations) Revolutions of 1848
- Revolutions per minute (RPM): definition, uses, and conversions Revolutions per minute
- Revolver: design, history, use and distinctions Revolver
- Revolver (disambiguation)
- Revolver (magazine)
- Revonnas: a small commune in Ain, Auvergne-Rhône-Alpes Revonnas
- Rewa district, Madhya Pradesh Rewa district
- Rewa Province, Fiji Rewa Province
- Reward (incentive and reinforcement) Reward
- REWE Group: German retail and tourism cooperative REWE Group
- Rex Harrison: English Stage and Film Actor (1908–1990) Rex Harrison
- Rex Reed — American Film Critic, Journalist and Actor Rex Reed
- Rex Robinson (1926–2015) — British character actor Rex Robinson (actor)
- Rex Ryan: American football coach and defensive strategist Rex Ryan
- Rex Tillerson: Oil executive and U.S. Secretary of State Rex Tillerson
- Rex Trailer — American Cowboy Entertainer and Television Host Rex Trailer
- Rex Warner: English Novelist and Translator of Classical Texts Rex Warner
- Rex Whitehead (Australian cricket umpire) Rex Whitehead
- Rexall Place: Edmonton's arena formerly known as Northlands Coliseum Rexall Place
- Rexburg, Idaho
- Rexhep Meidani
- Rey: meaning, origins, and cultural uses Rey
- Rey (Star Wars)
- Rey County (Ray) — Tehran Province, Iran Rey County
- Rey Mysterio (Óscar Gutiérrez): Career, Style and Legacy Rey Mysterio
- Rey (Ray, Rhagae) — ancient city and district of Tehran, Iran Rey, Iran
- Reydon, Oklahoma
- Reye's syndrome — acute encephalopathy and liver dysfunction in children and adolescents Reye's syndrome
- Reyhaneh Jabbari: case, trial and execution Reyhaneh Jabbari
- Reykjanesbær — municipality on Iceland's Reykjanes Peninsula Reykjanesbær
- Reykjavík — capital and largest city of Iceland Reykjavík
- Reykjavík Summit (October 1986) Reykjavík Summit
- Reykjavík–Keflavík Airport (Keflavik International Airport) Reykjavík-Keflavík Airport
- Reynaldo Bignone: Argentine general and final leader of the military junta Reynaldo Bignone
- Reynaldo Hahn: French mélodie composer and Belle Époque musician Reynaldo Hahn
- Reynaldo Rey (Harry Reynolds): American comedian and character actor Reynaldo Rey
- Reynolds Building (Winston-Salem) Reynolds Building
- Reynolds County, Missouri
- Reynoldsburg, Ohio
- Reyrieux — Commune in Ain, Auvergne-Rhône-Alpes, France Reyrieux
- Reyssouze — a rural commune in Ain, Auvergne-Rhône-Alpes Reyssouze
- Reza Alinejad — Iranian juvenile defendant facing execution Reza Alinejad
- Reza Shah Pahlavi (1878–1944) — Founder of the Pahlavi Dynasty Reza Shah Pahlavi
- Rezo Cheishvili
- RGB color model and its uses in digital imaging RGB
- Rhabdodontidae — Cretaceous herbivorous ornithopods Rhabdodontidae
- Rhabdomyosarcoma: pediatric soft-tissue cancer arising from skeletal muscle precursors Rhabdomyosarcoma
- Rhacophoridae: Old World shrub, bush and flying frogs Rhacophoridae
- Rhaetian Railway (RhB): Switzerland’s scenic metre‑gauge network Rhaetian Railway
- Rhamnus (buckthorns): description, distribution, uses and ecology Rhamnus
- Rhamphorhynchus: the long‑tailed Jurassic pterosaur Rhamphorhynchus
- Rhapsody (Apple operating system) Rhapsody (operating system)
- Rhapsody in Blue
- Rhäzüns — municipality in the Imboden region of Graubünden, Switzerland Rhäzüns
- Rhea: Titaness, South American birds, and Saturn's moon Rhea
- Rhea (bird)
- Rhea: Saturn's Second-Largest Moon Rhea (moon)
- Rhea (mythology) — Titaness and mother of the Olympians Rhea (mythology)
- Rhea Chiles
- Rhea Perlman
- Rhea Silvia: Mother of Romulus and Remus in Roman Myth Rhea Silvia
- Rhéal Fortin — Canadian lawyer and politician Rhéal Fortin
- Rheda-Wiedenbrück
- Rheden (municipality in Gelderland, Netherlands) Rheden
- Syngman Rhee (Rhee Syng-man) — First President of South Korea Rhee Syng-man
- Rhein-Erft-Kreis
- Rhein-Hunsrück-Kreis
- Rhein-Kreis Neuss
- Rhein-Lahn-Kreis: overview, landscape, administration and sites Rhein-Lahn-Kreis
- Rhein‑Neckar (Rhein‑Neckar‑Kreis): region and district in Baden‑Württemberg Rhein-Neckar
- Rhein-Pfalz-Kreis
- Rhein-Sieg-Kreis
- Rheinau, Switzerland
- Rheine: city on the Ems in North Rhine-Westphalia, Germany Rheine
- Rheineck — town in the Rhine Valley, canton of St. Gallen, Switzerland Rheineck
- Rheinfelden (Germany and Switzerland) Rheinfelden
- Rheinfelden (Baden)
- Rheinfelden District (Aargau, Switzerland) Rheinfelden District
- Rheinfelden, Switzerland: Rhine-side town in canton Aargau Rheinfelden, Switzerland
- Rheingau-Taunus — district in Hesse, Germany Rheingau-Taunus
- Rheinisch-Bergischer Kreis: district of the Bergisches Land in North Rhine-Westphalia Rheinisch-Bergischer Kreis
- Rheinstetten — city near Karlsruhe in Baden-Württemberg, Germany Rheinstetten
- Rheintal (Wahlkreis) — constituency of the canton of St. Gallen Rheintal (Wahlkreis)
- Rheinwald, Graubünden — municipality and alpine valley in Switzerland Rheinwald, Switzerland
- Rhenen — town and municipality in the province of Utrecht Rhenen
- Rhenium (element Re) Rhenium
- Rheology: the science of flow and deformation Rheology
- Rhesus macaque (Macaca mulatta) Rhesus macaque
- Rhetoric: Art and Study of Persuasion Rhetoric
- Rhetorical question
- Rhetorical Triangle: Ethos, Pathos, and Logos in Persuasion Rhetorical Triangle
- Rheumatic fever: causes, signs, diagnosis and prevention Rheumatic fever
- Rheumatism: overview, forms, history and clinical significance Rheumatism
- Rheumatoid arthritis: causes, symptoms, diagnosis and management Rheumatoid arthritis
- Rheydt (borough of Mönchengladbach) Rheydt
- Rhinatrematidae: the tailed or beaked caecilians of northern South America Rhinatrematidae
- Rhind Mathematical Papyrus: Egypt’s Principal Mathematical Manuscript Rhind Mathematical Papyrus
- Rhine Falls (Rheinfall) — Europe's largest waterfall Rhine Falls
- Rhine River
- Rhine–Main–Danube Canal Rhine-Main-Danube Canal
- Rhinebeck (town), New York
- Rhinebeck (village), New York
- Rhineland (Rheinland): Region along the Middle and Lower Rhine Rhineland
- Rhineland-Palatinate: geography, history, economy and cultural highlights Rhineland-Palatinate
- Rhinella — Neotropical true toads (beaked or Rio Viejo toads) Rhinella
- Rhinestone (1984 film) Rhinestone (movie)
- Rhinoceros: biology, species, distribution, and conservation Rhinoceros
- Rhinoceros (genus)
- Rhinoceros hornbill (Buceros rhinoceros) Rhinoceros hornbill
- Rhinoplasty (Nose Surgery): Overview, Techniques, and Considerations Rhinoplasty
- Rhinovirus: biology, symptoms, transmission and prevention Rhinovirus
- Rhins (river in central France) Rhins
- Rhipidistia — lobe-finned fishes ancestral to tetrapods Rhipidistia
- Rhizaria: diverse amoeboid eukaryotes including foraminifera and radiolaria Rhizaria
- Rhizobia: nitrogen‑fixing bacteria that form symbiotic nodules on legumes Rhizobia
- Rho (Greek letter) Rho
- Rho Cassiopeiae — the yellow hypergiant in Cassiopeia Rho Cassiopeiae
- Rho (Lombardy, Italy) Rho, Lombardy
- Rhode Island: Overview, Geography, History, and Notable Facts Rhode Island
- Rhode Island Sound
- Rhodes: Greek island of the Dodecanese Rhodes
- Rhodes — city on the island of Rhodes, capital of the Dodecanese Rhodes (city)
- Rhodes Scholarship
- Rhodes, Iowa: small city in central Iowa Rhodes, Iowa
- Rhodesia: Unrecognised state in Southern Africa (1965–1980) Rhodesia
- Rhodesia at the Olympic Games Rhodesia at the Olympics
- Rhodesian Ridgeback
- Rhodium: properties, occurrence, uses, and market significance Rhodium
- Rhododendron: overview, characteristics, history and uses Rhododendron
- Rhododendron niveum: a high‑altitude rhododendron of the eastern Himalaya Rhododendron niveum
- Rhododendron ponticum — pontic or common rhododendron Rhododendron ponticum
- Rhodri Morgan: Welsh Labour leader and First Minister (1939–2017) Rhodri Morgan
- Dicyemida (Rhombozoa) — microscopic parasites of cephalopod renal appendages Rhombozoa
- Rhombus
- Rhome, Texas — Overview and Key Facts Rhome, Texas
- Rhön: low mountain region in central Germany Rhön
- Rhön-Grabfeld — rural district in Lower Franconia, Bavaria Rhön-Grabfeld
- Rhonda Fleming: American film and television actress Rhonda Fleming
- Rhonda Smiley — television writer and producer Rhonda Smiley
- Rhondda (Rhondda Valleys) — coal-mining valleys of South Wales Rhondda
- Rhône (European river) Rhône
- Rhône (department)
- Rhône-Alpes — former administrative region of France Rhône-Alpes
- Rhopalostylis sapida (nīkau) — New Zealand's native palm Rhopalostylis sapida
- Rhubarb
- Rhyacian: Palaeoproterozoic period (2.30–2.05 billion years ago) Rhyacian
- Rhyl — Seaside town and community in North Wales Rhyl
- Rhyme: Sound Patterns in Poetry and Song Rhyme
- Rhyme royal
- Rhyme scheme: notation, common patterns, history and examples Rhyme scheme
- Rhynchosaur: Triassic herbivorous reptiles with distinctive beaks Rhynchosaur
- Rhynia — Early Devonian fossil genus of simple vascular plants Rhynia
- Rhynie — village and its Early Devonian fossil deposits Rhynie
- Rhynie chert
- Rhyolite (high-silica volcanic rock) Rhyolite
- Rhys Darby — New Zealand comedian and actor Rhys Darby
- Rhys Ifans
- Rhys Wakefield — Australian actor Rhys Wakefield
- Rhysling Award: Prize for Speculative Poetry Rhysling Award
- Rhythm: musical pulse, meter, and patterns Rhythm
- Rhythm and blues (R&B): origins, characteristics, and evolution Rhythm and blues
- Rhythm game (rhythm action video games) Rhythm game
- Rhythm guitar: role, techniques, notation and history Rhythm guitar
- Rhythm section
- Rhythmic Gymnastics: sport, apparatus, history and competition Rhythmic gymnastics
- Rhythmic Songs Chart — Billboard's rhythmic-format airplay ranking Rhythmic Songs Chart
- Rhythmite (rhythmic sedimentary layering) Rhythmite
- Rhytidectomy (Facelift): Overview, Techniques, Risks, and Recovery Rhytidectomy
- Ri Han-jae
- RIAA certification: U.S. sales and streaming awards for recorded music RIAA certification
- Riace Bronzes: Two Classical Greek Bronze Statues from Riace Marina Riace bronzes
- Riachão (Clementino Rodrigues) — Brazilian samba composer and singer Riachão (singer)
- Riad Ismat: Syrian Playwright, Director, and Cultural Figure Riad Ismat
- Rian Johnson — American Filmmaker, Writer, and Director Rian Johnson
- Riau: Province on Sumatra’s eastern coast Riau
- Riau Islands (province of Indonesia) Riau Islands
- Riaz, municipality in the canton of Fribourg Riaz
- Riaz Ahmed Gohar Shahi
- Riaz Shahid — Pakistani filmmaker, screenwriter and journalist Riaz Shahid
- Rib (anatomy): structure, function, development and cultural notes Rib
- Rib cage (thoracic cage) — structure, function, and clinical notes Rib cage
- Ribarrouy (commune in Pyrénées-Atlantiques) Ribarrouy
- Ribaute — small commune in Aude, Occitanie, southern France Ribaute
- Ribbed (NOFX album) Ribbed
- Ribbon — materials, uses, history, and types Ribbon
- Ribeauville (Aisne) — small commune in northern France Ribeauville
- Ribeauvillé — historic wine town in Alsace Ribeauvillé
- Ribeira Brava (municipality), São Nicolau, Cape Verde Ribeira Brava, Cape Verde (municipality)
- Ribeira Grande de Santiago, Cape Verde
- Ribeira Grande (municipality), Santo Antão, Cape Verde Ribeira Grande, Cape Verde (municipality)
- Ribeirão Preto (São Paulo) Ribeirão Preto
- Ribemont — commune in the Aisne department of northern France Ribemont
- Ribes: the genus of currants and gooseberries Ribes
- Ribes (Ardèche): Guide to the small commune in southern France Ribes, Ardèche
- Riboflavin (Vitamin B2): function, sources, stability and uses Riboflavin
- Ribonuclease (RNase) — enzymes that degrade RNA Ribonuclease
- Ribose: structure, biological roles, and uses of the five‑carbon sugar Ribose
- Ribosome: the cellular machine that builds proteins Ribosome
- Ribouisse: small rural commune in Aude, Occitanie, France Ribouisse
- Ribozyme: catalytic RNA molecules and their biological and experimental roles Ribozyme
- Ric Flair: career, style, and legacy of 'The Nature Boy' Ric Flair
- Ric Ocasek: Singer, Songwriter, Producer and Frontman of The Cars Ric Ocasek
- Ric Suggitt (Canadian rugby player and coach) Ric Suggitt
- Ricardian model of international trade Ricardian model
- Ricardinho (born 1976) — Brazilian footballer Ricardinho
- Ricardo Anaya — Mexican lawyer and politician Ricardo Anaya
- Ricardo Arias Calderón — Panamanian Christian Democrat and vice president Ricardo Arias Calderón
- Ricardo Bauleo — Argentine actor (1946–2014) Ricardo Bauleo
- Ricardo Bofill: life, work and influence of the Catalan architect Ricardo Bofill
- Ricardo Brennand: Brazilian industrialist, collector and founder of a major cultural institute Ricardo Brennand
- Ricardo Cabanas — Swiss footballer and midfielder Ricardo Cabanas
- Ricardo Carvalho
- Ricardo de Aparici (1940–2019) — Argentine politician Ricardo de Aparici
- Ricardo Domínguez (Pelón) — Mexican Boxer, 1985–2017 Ricardo Domínguez
- Ricardo dos Santos — Brazilian Surfer (1990–2015) Ricardo dos Santos
- Ricardo Faty – French Professional Footballer Ricardo Faty
- Ricardo Gallego — Spanish midfielder and Real Madrid stalwart Ricardo Gallego
- Ricardo Gomes (Brazilian footballer and manager) Ricardo Gomes
- Ricardo Goulart — Brazilian forward and attacking midfielder Ricardo Goulart
- Ricardo Lagos — Chilean lawyer, social democrat and 2000–2006 president Ricardo Lagos
- Ricardo López Felipe — Spanish goalkeeper known as Ricardo Ricardo López Felipe
- Ricardo Luis Lorenzetti: Argentine jurist and Supreme Court justice Ricardo Lorenzetti
- Ricardo Martinelli — Panamanian businessman and former president Ricardo Martinelli
- Ricardo Migliorisi — Paraguayan painter and stage designer Ricardo Migliorisi
- Ricardo Moniz — Dutch football coach and former player Ricardo Moniz
- Ricardo Montalbán — Mexican actor, activist, and cultural icon Ricardo Montalbán
- Ricardo Montaner (Héctor Eduardo Reglero Montaner) Ricardo Montaner
- Ricardo Montaner (1987 album) Ricardo Montaner (album)
- Ricardo Mórtola — Ecuadorian architect of the Estadio Monumental Ricardo Mórtola