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Noun nitrobacterium has 1 sense
  1. nitrobacterium - 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
    --1 is a kind of     bacteria, bacterium
    --1 has particulars:
     nitrate bacterium, nitric bacterium; nitrite bacterium, nitrous bacterium
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