| Term | Definition | Contributor | Modified |
|---|---|---|---|
| runway | No definition provided | Ryan McGranaghan | 2023.04.16 |
| rupelian | No definition provided | Ryan McGranaghan | 2023.04.16 |
| rupture | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Rupture | No definition provided | Christopher Rauch | 2023.12.01 |
| Rural architecture | No definition provided | Christopher Rauch | 2023.12.01 |
| Rural free delivery | No definition provided | Christopher Rauch | 2023.12.01 |
| Rural life | No definition provided | Christopher Rauch | 2023.12.01 |
| Rural poetry | No definition provided | Christopher Rauch | 2023.12.01 |
| Rural schools | No definition provided | Christopher Rauch | 2023.12.01 |
| Rurick (Ship) | No definition provided | Christopher Rauch | 2023.12.01 |
| Rusakovite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ruse (Game) | No definition provided | Christopher Rauch | 2023.12.01 |
| Rushes | No definition provided | Christopher Rauch | 2023.12.01 |
| Rush of snowmelt flood | The rate of change in time of discharge and water surface elevations during spring snowmelt. | GCW Glossary | 2023.03.27 |
| Rush (Revenue steamer) | No definition provided | Christopher Rauch | 2023.12.01 |
| Russellite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Russia--Hist | No definition provided | Christopher Rauch | 2023.12.01 |
| Russia--Hist.--1533-1613 | No definition provided | Christopher Rauch | 2023.12.01 |
| Russia--Hist.--1613-1689 | No definition provided | Christopher Rauch | 2023.12.01 |
| Russia--Hist.--1689-1800 | No definition provided | Christopher Rauch | 2023.12.01 |