| NOUN | animal | nitrobacterium | any of the bacteria in the soil that take part in the nitrogen cycle |
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| Meaning | 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. | |
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| Narrower | nitrate bacterium, nitric bacterium | Any of the nitrobacteria that oxidize nitrites into nitrates |
| nitrite bacterium, nitrous bacterium | Any of the nitrobacteria that oxidize ammonia into nitrites | |
| Broader | bacteria, bacterium | (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission |
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