nitrobacterium

noun

ni·​tro·​bac·​te·​ri·​um ¦nī-(ˌ)trō-bak-¦tir-ē-əm 

plural nitrobacteria ¦nī-(ˌ)trō-bak-¦tir-ē-ə 

: nitrifying bacterium

Word History

Etymology

New Latin, from nitr- + bacteria

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