denitrify Syllabification: (de·ni·tri·fy)Pronunciation: /dēˈnītrəˌfī/Definition of denitrify verb (denitrifies, denitrifying, denitrified) [with object] (chiefly of bacteria) remove the nitrates or nitrites from (soil, air, or water) by chemical reduction. Derivatives denitrificationPronunciation: /-ˌnītrəfiˈkāSHən/ noun denitrify in other Oxford dictionaries Definition of denitrify in the British & World English dictionary