| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Semeiology | No definition provided | Christopher Rauch | 2023.12.01 |
| Semeiomelodion | No definition provided | Christopher Rauch | 2023.12.01 |
| Semele (Minor planet) | No definition provided | Christopher Rauch | 2023.12.01 |
| Semen | No definition provided | Christopher Rauch | 2023.12.01 |
| Semenovite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| semi | No definition provided | Ryan McGranaghan | 2023.04.16 |
| semi annual | No definition provided | Ryan McGranaghan | 2023.04.16 |
| semi arid climate | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Semi-barium stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Semi-barium stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Semi-barium stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Semicircular canals | No definition provided | Christopher Rauch | 2023.12.01 |
| semiconductor | a material that is between the conductor and insulator in ability to conduct electrical current. | John Kunze | 2024.11.15 |
| semiconfined | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Semi-detached binary stars | A binary system whose secondary member fills its Roche lobe but whose primary member does not. | Ryan McGranaghan | 2023.04.16 |
| semi diurnal | No definition provided | Ryan McGranaghan | 2023.04.16 |
| semi geostrophic | No definition provided | Ryan McGranaghan | 2023.04.16 |
| semi major axis | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Semimajor axis | Half the length of the major axis of an ellipse; a standard element used to describe an elliptical orbit. | Ryan McGranaghan | 2023.04.16 |
| Semimajor axis | Half the length of the major axis of an ellipse; a standard element used to describe an elliptical orbit. | Ryan McGranaghan | 2023.04.16 |