| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Reaction-time | No definition provided | Christopher Rauch | 2023.12.01 |
| Reaction. Velocity of (Chemistry) | No definition provided | Christopher Rauch | 2023.12.01 |
| reactivity | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Readers and speakers | No definition provided | Christopher Rauch | 2023.12.01 |
| Readers and speakers--Geography | No definition provided | Christopher Rauch | 2023.12.01 |
| Readers and speakers--History | No definition provided | Christopher Rauch | 2023.12.01 |
| Readers and speakers--Natural history | No definition provided | Christopher Rauch | 2023.12.01 |
| readiness of | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Reading | No definition provided | Christopher Rauch | 2023.12.01 |
| Reading, Choice of | No definition provided | Christopher Rauch | 2023.12.01 |
| Reading (Elementary) | No definition provided | Christopher Rauch | 2023.12.01 |
| Ready-reckoners | No definition provided | Christopher Rauch | 2023.12.01 |
| reagent | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Reagents. Chemical | No definition provided | Christopher Rauch | 2023.12.01 |
| Real actions | No definition provided | Christopher Rauch | 2023.12.01 |
| Real estate | No definition provided | Christopher Rauch | 2023.12.01 |
| Real estate business | No definition provided | Christopher Rauch | 2023.12.01 |
| Realgar | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Realism | No definition provided | Christopher Rauch | 2023.12.01 |
| Realism in art | No definition provided | Christopher Rauch | 2023.12.01 |