denitrifying bacterium

noun
plural denitrifying bacteria

Definition of denitrifying bacterium 

: any of various bacteria (such as Thiobacillus denitrificans and Paracoccus denitrificans) that bring about denitrification used especially of forms that reduce nitrates to nitrites or nitrites to nitrogen gas (such as many common putrefactive organisms of manure and soil) — see achromobacter

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