| |||
| non-luminous | |||
| obscure | |||
| dim | |||
| aphotic | |||
|
obscur : 87 phrases in 31 subjects |
| Agriculture | 1 |
| American usage, not spelling | 1 |
| Amphibians and reptiles | 2 |
| Astronomy | 8 |
| Automated equipment | 1 |
| Biology | 1 |
| Biotechnology | 3 |
| British usage, not spelling | 1 |
| Chemistry | 1 |
| Construction | 2 |
| Cultural studies | 1 |
| Entomology | 5 |
| Environment | 1 |
| Figurative | 1 |
| Fish farming pisciculture | 2 |
| General | 5 |
| Ichthyology | 6 |
| Law | 1 |
| Life sciences | 3 |
| Mammals | 3 |
| Medical | 3 |
| Metallurgy | 1 |
| Natural resourses and wildlife conservation | 7 |
| Natural sciences | 1 |
| Ornithology | 17 |
| Photography | 1 |
| Radiation | 2 |
| Remote sensing | 1 |
| Statistics | 1 |
| Technology | 2 |
| Zoology | 2 |