nitrous bacteria(n = noun.animal) nitrosobacteria - soil bacteria that oxidize ammonia to nitrites;
is a kind of eubacteria, eubacterium, true bacteria
is a member of genus nitrosomonas, nitrosomonas

bacteria, bacteria bed, bacteria family, bacteria genus, bacteria order, bacteria species, endospore-forming bacteria, enteric bacteria, gliding bacteria, nitric bacteria, nitrous, nitrous acid, nitrous bacterium, nitrous oxide, penicillin-resistant bacteria, phototrophic bacteria, phototropic bacteria, potato scab bacteria, purple bacteria, pus-forming bacteria, ring rot bacteria, slime bacteria, sulfur bacteria, sulphur bacteria, true bacteria