| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Orlandiite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orleans, Battle of. 1870 | No definition provided | Christopher Rauch | 2023.12.01 |
| Orlovite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orlymanite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ornament | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornamental alphabets | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornamental design | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornamental heraldry | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornaments (Music) | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornithological societies | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornithology | No definition provided | Christopher Rauch | 2023.12.01 |
| Ornithorhynchus | No definition provided | Christopher Rauch | 2023.12.01 |
| Oro | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orobanchaceae | No definition provided | Christopher Rauch | 2023.12.01 |
| orogen | No definition provided | Ryan McGranaghan | 2023.04.16 |
| orogenesis | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orogenesis | The process of mountain building through tectonic forces of compression and volcanism. | GCW Glossary | 2023.03.27 |
| Orogenic belt | A major range of mountains on the continents. | GCW Glossary | 2023.03.27 |
| orogenic collapse | The process in which mountains begin to collapse under their own weight and spread out laterally. | Ryan McGranaghan | 2023.04.16 |
| orogeny | Orogeny refers to natural mountain building, and may be studied as (a) a tectonic structural event, (b) as a geographical event, and (c) a chronological event. Orogenic events (a) cause distinctive st ructural phenomena and related tectonic activity, (b) affect certain regions of rocks and crust, and (c) happen within a specific period of time. [Wikipedia] | Ryan McGranaghan | 2023.04.16 |