| r ... rabbit |
| rabbit hair ... racerunner |
| Racetrack Playa ... Radagaisius |
| Radama I ... radiant |
| radiant electric resistance heating system ... radical scavenger |
| radical theory ... radio wave |
| radio-frequency accelerating cavity ... radiowave |
| radish ... Raetia |
| Raetian language ... Ragusa |
| Ragusan Dalmatian ... railroad track |
| Railroad Tycoon ... Rainy Lake |
| Raipur ... Rajasthani languages |
| Rajasthani literature ... Rakosi, Carl |
| Rakosi, Matyas ... Rama Deva Raya |
| Rama I ... Ramblas |
| Rambler ... Ramon Berenguer IV |
| Ramon Borrell ... Ramsey Abbey |
| Ramsey's numbers ... Randall, John Herman, Jr. |
| Randall, Samuel J(ackson) ... range crane fly |
| range finder ... Ransier, Alonzo J. |
| Ransmayr, Christoph ... rapid application development |
| Rapid City ... Rascher, Sigurd |
| Raschig process ... raster line |
| Rastrakuta Dynasty ... Rathke, Martin H |
| Rathlin Island ... Ratzenhofer, Gustav |
| Rau, Gretchen ... Rawalpindi, Treaty of |
| Rawayfi ibn Thabit ... Rayleigh number |
| Rayleigh scattering ... RCA Records |
| RCA VideoDisc ... Read, Nathan |
| Read, Opie ... real number |
| Real Plan ... Rebild Hills |
| rebirth ... reciprocal servitude |
| Reciprocal Trade Agreements Act ... reconstructive surgery |
| record ... recurring digital invariant |
| recursion theory ... red flyer |
| Red Fort ... Red River of the North |
| Red River of the South Valley ... red-breasted nuthatch |
| red-breasted toucan ... Redeemer governments |
| Redemptorist ... reduccion |
| reduced mass ... Reed, John |
| Reed, Leonard ... reference librarianship |
| reference, theory of ... reformatory |
| reformatting ... Regen, Ivan |
| Regence style ... Regio, Jose |
| Regiomontanus ... Regosol |
| regression ... Reich-Ranicki, Marcel |
| Reicha, Anton ... Reigate and Banstead |
| Reilly, Charles Nelson ... reinsurance |
| Reinsurance Treaty ... relative magnetometer |
| relative motion ... Relief Church |
| relief map ... reluctance |
| reluctance motor ... remora |
| remote control ... Renard, Georges |
| Renard, Jules ... Rennenkampf, P. K. |
| Renner, Janos ... reorganization |
| reovirus ... Representatives, House of |
| Representatives, House of ... Republican Party |
| Republican Party ... Resedaceae |
| Resen, Hans Paulsen ... residuary resistance |
| residue ... resonance hybrid |
| resonance ionization ... Restif, Nicolas-Edme |
| resting energy expenditure ... retaining wall |
| Retalhuleu ... Retiro Park |
| retort ... Reus |
| reused wool ... reversal |
| reversal film ... Revolution, The |
| Revolutionary Command Council ... Rey, Abel |
| Rey, Fernando ... RGH law |
| Rh blood group system ... Rhenish Franconian |
| Rhenish Friedrich-Wilhelm University of Bonn ... rhinitis |
| rhinoceros ... Rhodes, James Ford |
| Rhodes, Lawrence ... Rhyacotritonidae |
| Rhyl ... Riall, Phineas |
| Rialto ... ribonuclease |
| ribose ... Rice, Linda Johnson |
| Rice, Luther ... Richards, Dickinson Woodruff |
| Richards, Ellen Swallow ... Richelieu, Armand-Jean du Plessis, cardinal et duc de |
| Richelieu, Louis-Francois-Armand du Plessis, Duke de ... Richthofen, Manfred, Freiherr von |
| Ricimer ... ridge |
| ridge and swale ... Riemannian geometry |
| Riemenschneider, Tilman ... Riggs Bank |
| Riggs, Robert Larimore ... Rigord |
| rigour ... rima |
| Rima Hyginus ... ring with unity |
| Ring, Barbra ... Rio Branco, Jose Maria da Silva Paranhos, Baron of |
| Rio Claro ... Ripley, Alexandra |
| Ripley, George ... Rissho-Kosei-kai |
| Rissik, Johann ... Rivaldo |
| Rivard, Yvon ... Rivet, Paul |
| Rivette, Jacques ... road race |
| Road River Group ... Robert College |
| Robert d'Oilly ... Roberts, John G., Jr. |
| Roberts, Joseph Jenkins ... Robin, Leo |
| Robinette, John Josiah ... Robiquet, Pierre-Jean |
| roble beech ... Rochelle salt |
| Rocher de Cancale ... rock gunnel |
| Rock Hill ... Rocket |
| rocket ... rod |
| rod ... Rodrigues Lobo, Francisco |
| Rodrigues, Amalia da Piedade Rebordao ... Roger of Salisbury |
| Roger of Wendover ... Rohilla |
| Rohilla War ... role |
| role model ... rolling strike |
| Rolling Thunder ... Roman Psalter |
| Roman religion ... Romans, Letter of Paul to the |
| Romans-sur-Isere ... Romero, Matias |
| Romero, Oscar Arnulfo ... Ronglu |
| rongo-rongo ... Roosevelt, Franklin D. |
| Roosevelt, Kermit ... Roquefort |
| roquet ... rose hip |
| Rose Island ... rosella |
| roselle ... Rosetta |
| Rosetta ... Rossby equations |
| Rossby wave ... Rostropovich, Mstislav |
| rostrum ... rotational time |
| rotative engine ... Rotimi, Ola |
| rotisserie baseball ... Rougemont, Denis de |
| Rouges ... Rourea glabra |
| Rourea volubilis ... Rowe, John H. |
| Rowe, Nicholas ... Royal Academy of Portuguese History |
| Royal Academy of Sciences ... Royal Danish Ballet |
| Royal Dublin Society ... Royal Palace |
| Royal Palace ... Royko, Michael |
| Royster, Vermont ... Rubenstein, Louis |
| Rubey, William W. ... Ruda Slaska |
| Rudaki ... Rudra |
| Rudra Singh ... Rugendamm |
| Rugendas, Johann Moritz ... Rules Enabling Act |
| rules of the road ... Runcorn, Stanley Keith |
| Rundi ... Ruppell's fox |
| Ruppell, Eduard ... Rusk, Howard A. |
| Ruska, Ernst ... Russian Blue |
| Russian Catholic church ... Rustaveli, Mount |
| Rustaveli, Shota ... Rutland |
| Rutland ... Ryan, George |
| Ryan, Kay ... Ryongchon |
| ryotwari system ... |
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