nitrobacteria

plural noun, singular ni·tro·bac·te·ri·um [nahy-troh-bak-teer-ee-uh m] /ˌnaɪ troʊ bækˈtɪər i əm/.

1. certain bacteria in the soil involved in nitrifying processes.

pl n singular -terium (-ˈtɪərɪəm)

1. soil bacteria of the order Pseudomonadales that are involved in nitrification, including species of Nitrosomonas and Nitrobacter