| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Rustenburgite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Rustic woodwork | No definition provided | Christopher Rauch | 2023.12.01 |
| Rustless coatings | No definition provided | Christopher Rauch | 2023.12.01 |
| Rustumite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ruthenarsenite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ruthenian language | No definition provided | Christopher Rauch | 2023.12.01 |
| Ruthenian literature | No definition provided | Christopher Rauch | 2023.12.01 |
| Ruthenian literature--Bibl | No definition provided | Christopher Rauch | 2023.12.01 |
| Ruthenians | No definition provided | Christopher Rauch | 2023.12.01 |
| Ruthenians in Austria | No definition provided | Christopher Rauch | 2023.12.01 |
| Ruthenians in Canada | No definition provided | Christopher Rauch | 2023.12.01 |
| Ruthenians in Galicia | No definition provided | Christopher Rauch | 2023.12.01 |
| Rutheniridosmine | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Rutheniridosmium | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ruthenium | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ruthenosmiridium | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Rutherfordine | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Rutile | No definition provided | Ryan McGranaghan | 2023.04.16 |
| RV Tauri variable stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Rye | No definition provided | Christopher Rauch | 2023.12.01 |