| nitrobacter | (n) rod-shaped soil bacteria, Syn. genus Nitrobacter |
| nitrobacteriaceae | (n) usually rod-shaped bacteria that oxidize ammonia or nitrites: nitrobacteria, Syn. family Nitrobacteriaceae |
| nitrobacterium | (n) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates |
| Nitrobacter | prop. n. A genus of rod-shaped soil bacteria. |
| nitrobacteria | n. Soil bacteria that convert nitrites to nitrates. |
| Nitrobacteriaceae | prop. n. A natural family of usually rod-shaped bacteria that oxidize ammonia or nitrites: nitrobacteria. |