/ Dictionary / Index T tone arm: Meaning and Definition of Find definitions for: tone' arm" Pronunciation: [key] the free-swinging bracket of a phonograph containing the pickup. Also called pickup arm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tone tone cluster Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language