| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Apodes | No definition provided | Christopher Rauch | 2023.12.01 |
| apogee | That point on the path of an Earth-orbiting satellite most distant from the center of the Earth. Compare perigee. | Ryan McGranaghan | 2023.04.16 |
| Apogee | The point in the orbit of the moon or an artificial satellite that is farthest from the terrestrial center and at which the body's velocity is at a minimum. | Ryan McGranaghan | 2023.04.16 |
| Apollo group | A member of a class of near-Earth asteroids (NEAs) that have orbital semi-major axes greater than that of the Earth (> 1 astronomical unit) but perihelion distances less than the Earth's aphelion dist ance (less than 1.017 AU); thus, they cross the Earth's orbit when near the perihelia of their orbits. They are named for the prototype Apollo. | Ryan McGranaghan | 2023.04.16 |
| Apologetics | No definition provided | Christopher Rauch | 2023.12.01 |
| Apomorphine | No definition provided | Christopher Rauch | 2023.12.01 |
| Apophyllite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Apophyllite (KF) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Apophyllite (KOH) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Apophyllite (NaF) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Apoplexy | No definition provided | Christopher Rauch | 2023.12.01 |
| Apostles | No definition provided | Christopher Rauch | 2023.12.01 |
| Apostles’ creed | No definition provided | Christopher Rauch | 2023.12.01 |
| Apostolic church | No definition provided | Christopher Rauch | 2023.12.01 |
| Apostolic fathers | No definition provided | Christopher Rauch | 2023.12.01 |
| Apostolic succession | No definition provided | Christopher Rauch | 2023.12.01 |
| Apothecaries | No definition provided | Christopher Rauch | 2023.12.01 |
| Apothecium | No definition provided | Christopher Rauch | 2023.12.01 |
| Apothegms | No definition provided | Christopher Rauch | 2023.12.01 |
| Appalachian Indians | No definition provided | Christopher Rauch | 2023.12.01 |