/ Dictionary / Index T tono-: Meaning and Definition of Find definitions for: tono- Pronunciation: [key] a combining form with the meanings “stretching,” “tension,” “tone,” used in the formation of compound words: tonometer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Tönnies tonometer Related Content Daily Word Quiz: reiterate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language