• Webster's Revised Unabridged Dictionary
    • n Nitrifier (Chem) An agent employed in nitrification.
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Century Dictionary and Cyclopedia
    • n nitrifier Anything which serves to bring about or to facilitate the production of niter or nitrates; specifically, in bacteriology, any micro-organism which is capable of oxidizing ammonia to nitrous acid, or nitrous acid to nitric acid; a micro-organism which serves to fix, and accumulate in the soil, the free nitrogen of the air. See nitrogen-fixing.
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In literature:

The heating of soil to the same temperature effectually destroys its nitrifying power.
"Scientific American Supplement, Vol. XIX, No. 470, Jan. 3, 1885" by Various
The work of the nitrifying germs is called nitrification.
"The First Book of Farming" by Charles L. Goodrich
To this class of organism the nitrifying organisms belong.
"Manures and the principles of manuring" by Charles Morton Aikman