/ Dictionary / Index N nitrifier: Meaning and Definition of Find definitions for: ni•tri•fi•er Pronunciation: (nī'tru-fī"ur), [key] — n. a person or thing that nitrifies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nitrification nitrify Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language