| R Monocerotis ... radiation measurement |
| radiation pressure ... Rahman, Mujibur |
| Rahner, Karl ... Rakosi, Matyas |
| Rakovski, Georgi Sava ... Rampolla, Mariano |
| Rampur ... Rankin, Jeannette |
| Rankine cycle ... ratel |
| ratfish ... Raynal, Guillaume-Thomas, abbe de |
| Raynaud's disease ... reciprocity |
| recit ... Reddie, Cecil |
| Redding ... Reformed Church of France |
| Reformed Church of Hungary ... Reims Cathedral |
| rein orchid ... remora |
| Remscheid ... Replacements, the |
| replevin ... restrictive covenant |
| reststrahlen ... revolver |
| revolving credit ... rhizomastigote |
| rhizome ... Ribeiro Prto |
| Ribeiro, Aquilino ... Richardson, Sir John |
| Richardson, Sir Owen Willans ... Riegger, Wallingford |
| Riehl, Wilhelm Heinrich ... rinceau |
| rinderpest ... Ritschl, F.W. |
| Ritsos, Yannis ... roasting |
| Roatan ... Robinson, Edward |
| Robinson, Edward G. ... Rockefeller, David |
| Rockefeller, John D. ... roentgen |
| Roentgen, Abraham ... Rolla |
| Rolland, Romain ... Romer |
| Romer, Alfred Sherwood ... Rosario |
| rosary ... Rosse, William Parsons, 3rd earl of |
| Rossellini, Roberto ... Roumanille, Joseph |
| round ... Royal Courts of Justice |
| Royal Danish Ballet ... ruddy turnstone |
| Rude, Francois ... Rundi |
| Rundstedt, Gerd von ... Russian Revolution of 1917 |
| Russian Social-Democratic Workers' Party ... Rye |
| Rye ... |
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