/ Dictionary / Index N niton: Meaning and Definition of Find definitions for: ni•ton Pronunciation: (nī'ton), [key] — n. (formerly) radon. Symbol: Nt Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nit-lamp nitpick Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language