Ni·tri·fy v. t. [imp. & p. p. Nitrified p. pr. & vb. n. Nitrifying ]  Chem. To combine or impregnate with nitrogen; to convert, by oxidation, into nitrous or nitric acid; to subject to, or produce by, nitrification.
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  nitrify
       v 1: convert into nitric acid, nitrous acid, or nitrate,
            especially with the action of nitrobacteria
       2: treat with nitrogen or a nitrogen compound [syn: nitrogenize,
           nitrogenise]
       3: treat (soil) with nitrates [ant: denitrify]
       [also: nitrified]