| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Roller-polo | No definition provided | Christopher Rauch | 2023.12.01 |
| Roller-skating | No definition provided | Christopher Rauch | 2023.12.01 |
| Rollers (Printing) | No definition provided | Christopher Rauch | 2023.12.01 |
| Rolling-mill machinery | No definition provided | Christopher Rauch | 2023.12.01 |
| Rolling-mills | No definition provided | Christopher Rauch | 2023.12.01 |
| Rolling-stock | No definition provided | Christopher Rauch | 2023.12.01 |
| Rolls (Iron mills) | No definition provided | Christopher Rauch | 2023.12.01 |
| Rolls (Iron mills)--Calibration | No definition provided | Christopher Rauch | 2023.12.01 |
| Romaic language | No definition provided | Christopher Rauch | 2023.12.01 |
| Romaic literature | No definition provided | Christopher Rauch | 2023.12.01 |
| Roman antiquities | No definition provided | Christopher Rauch | 2023.12.01 |
| Roman architecture | No definition provided | Christopher Rauch | 2023.12.01 |
| Roman art | No definition provided | Christopher Rauch | 2023.12.01 |
| Roman Catholic church | No definition provided | Christopher Rauch | 2023.12.01 |
| Romance languages | No definition provided | Christopher Rauch | 2023.12.01 |
| Romance literature | No definition provided | Christopher Rauch | 2023.12.01 |
| Romance literature--Bibl | No definition provided | Christopher Rauch | 2023.12.01 |
| Roman cement | No definition provided | Christopher Rauch | 2023.12.01 |
| Romance philology | No definition provided | Christopher Rauch | 2023.12.01 |
| Romance philology--Bibl | No definition provided | Christopher Rauch | 2023.12.01 |