| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Blakeite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Blanchardite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Blanche (Steamer) | No definition provided | Christopher Rauch | 2023.12.01 |
| Blank-books | No definition provided | Christopher Rauch | 2023.12.01 |
| blanket bog | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Blankets | No definition provided | Christopher Rauch | 2023.12.01 |
| Blank fields | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Blast-furnaces | No definition provided | Christopher Rauch | 2023.12.01 |
| Blasting | No definition provided | Christopher Rauch | 2023.12.01 |
| Blasting-oil | No definition provided | Christopher Rauch | 2023.12.01 |
| Blasting, Submarine | No definition provided | Christopher Rauch | 2023.12.01 |
| Blastophaga grossorum | No definition provided | Christopher Rauch | 2023.12.01 |
| Blatonite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Blatta | No definition provided | Christopher Rauch | 2023.12.01 |
| Blattariae | No definition provided | Christopher Rauch | 2023.12.01 |
| Blatterite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Blazars | A term specifying BL Lac objects or quasars when the continuum radiation emitted from the active nucleus is highly polarized and very variable. | Ryan McGranaghan | 2023.04.16 |
| Blazars | A term specifying BL Lac objects or quasars when the continuum radiation emitted from the active nucleus is highly polarized and very variable. | Ryan McGranaghan | 2023.04.16 |
| Blazars | A term specifying BL Lac objects or quasars when the continuum radiation emitted from the active nucleus is highly polarized and very variable. | Ryan McGranaghan | 2023.04.16 |
| Blazars | A term specifying BL Lac objects or quasars when the continuum radiation emitted from the active nucleus is highly polarized and very variable. | Ryan McGranaghan | 2023.04.16 |