| Term | Definition | Contributor | Modified |
|---|---|---|---|
| orthomatrix | A type of matrix consisting of recrystallized detrital lutum (clay fraction, less than 2 micron) or protomatrix. | Ryan McGranaghan | 2023.04.16 |
| Orthominasragrite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orthopædia | No definition provided | Christopher Rauch | 2023.12.01 |
| Orthopedia | No definition provided | Christopher Rauch | 2023.12.01 |
| Orthopedia--Hospitals and institutions | No definition provided | Christopher Rauch | 2023.12.01 |
| Orthopedic apparatus | No definition provided | Christopher Rauch | 2023.12.01 |
| Orthopedic surgery | No definition provided | Christopher Rauch | 2023.12.01 |
| Orthopinakiolite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ortho- (Prefix in chemistry) | No definition provided | Christopher Rauch | 2023.12.01 |
| Orthoptera | No definition provided | Christopher Rauch | 2023.12.01 |
| orthorhombic | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orthose | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orthoserpierite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orthowalpurgite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Osage Indians | No definition provided | Christopher Rauch | 2023.12.01 |
| Osage Indians: Ponca Indians | No definition provided | Christopher Rauch | 2023.12.01 |
| Osakaite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Osarizawaite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Osarsite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Osbornite | No definition provided | Ryan McGranaghan | 2023.04.16 |