nitrify

nitrify (third-person singular simple present nitrifies, present participle nitrifying, simple past and past participle nitrified)

1. (transitive) To treat, or react with nitrogen or a nitrogen-containing compound.
2. (transitive) To convert ammonia or similar compound to a nitrate by oxidation, especially by the action of a microorganism.
3. (intransitive) To become nitre.

• denitrify

• nitrification