verb (used with object), denitrified, denitrifying. Chemistry.
to remove nitrogen or nitrogen compounds from.
to reduce (nitrates) to nitrites, ammonia, and free nitrogen, as in soil by microorganisms.

1890–95; de- + nitrify

denitrification, noun
denitrifier, denitrificator, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
denitrify (diːˈnaɪtrɪˌfaɪ)
vb , -fies, -fying, -fied
to undergo or cause to undergo loss or removal of nitrogen compounds or nitrogen

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The plant nitrifies but does not denitrify the wastewater.
The package plant was originally designed to denitrify using a methanol feed reactor.
The oxidation basin is operated to nitrify and denitrify, reducing both the ammonia and nitrate concentrations in the wastewater.
Under anaerobic conditions, cyanides denitrify to gaseous nitrogen compounds that enter the atmosphere.
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