| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Odd-fellows, Independent order of--Symbolism | No definition provided | Christopher Rauch | 2023.12.01 |
| Odes | No definition provided | Christopher Rauch | 2023.12.01 |
| Odinite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Odintsovite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Odonata | No definition provided | Christopher Rauch | 2023.12.01 |
| Odontograph | No definition provided | Christopher Rauch | 2023.12.01 |
| Odontology | No definition provided | Christopher Rauch | 2023.12.01 |
| Odors | No definition provided | Christopher Rauch | 2023.12.01 |
| O dwarf stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| O dwarf stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| O dwarf stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Oecology | No definition provided | Christopher Rauch | 2023.12.01 |
| Oecumenical councils | No definition provided | Christopher Rauch | 2023.12.01 |
| Oedema | No definition provided | Christopher Rauch | 2023.12.01 |
| Oedogoniaceae | No definition provided | Christopher Rauch | 2023.12.01 |
| Oef stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Oef stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Oef stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Oef stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Oellacherite | No definition provided | Ryan McGranaghan | 2023.04.16 |