The Collaborative International Dictionary
Denitrify \De*ni"tri*fy\, v. t. [Pref. de- + nitrogen + -fy.] To deprive of, or free from, nitrogen.
Wiktionary
vb. (context transitive chemistry English) to remove nitrogen, often through the breakdown of nitrogenous compounds and the release of nitrogen gas.
WordNet
v. remove nitrogen from; "Denitrify the soil" [ant: nitrify]
[also: denitrified]
Wikipedia
Usage examples of "denitrify".
Borazjani was a small dark-skinned white-haired man, speaking with a pointer before a large screen, which was now showing video images of the various heating methods that had been tried: black dust and lichen on the poles, the orbiting mirrors that had sailed out from Luna, the moholes, the greenhouse gas factories, the ice asteroids burning up in the atmosphere, the denitrifying bacteria, and then all the rest of the biota.