| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Sidereal geochronology | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Sidereal system | No definition provided | Christopher Rauch | 2023.12.01 |
| siderian | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Siderite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Siderography | No definition provided | Christopher Rauch | 2023.12.01 |
| Sideronatrite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| siderophile | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Siderophyllite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Siderostat | No definition provided | Christopher Rauch | 2023.12.01 |
| Siderostats | A mirror arrangement with clock drive that reflects light from a celestial body to a fixed position. | Ryan McGranaghan | 2023.04.16 |
| Siderotil | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Sidewalk lights | No definition provided | Christopher Rauch | 2023.12.01 |
| Sidewalk-lights | No definition provided | Christopher Rauch | 2023.12.01 |
| Sidewalks | No definition provided | Christopher Rauch | 2023.12.01 |
| Sidorenkite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Sidpietersite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Sidwillite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Siegenite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Sieges | No definition provided | Christopher Rauch | 2023.12.01 |
| Siege, State of | No definition provided | Christopher Rauch | 2023.12.01 |