Definition of nitrobacterium in US English:

nitrobacterium

noun

  • Any nitrifying bacterium; especially one of the genus Nitrobacter, which oxidizes nitrites to nitrates. Usually in plural.

Origin

Late 19th century; earliest use found in Journal of the Royal Microscopical Society. From nitro- + bacterium, after French nitrobactérie.

Pronunciation

nitrobacterium

/ˌnʌɪtrəʊbakˈtɪərɪəm/