/ Dictionary / Index I isotone: Meaning and Definition of Find definitions for: i•so•tone Pronunciation: (ī'su-tōn"), [key] — n. Physics. one of two or more atoms having an equal number of neutrons but different atomic numbers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isotimic isotonic Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language