/ Dictionary / Index S subtonic: Meaning and Definition of Find definitions for: sub•ton•ic Pronunciation: (sub-ton'ik), [key] — n. the seventh tone of a scale, being the next below the upper tonic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: subtonic (Thesaurus) subtlety subtopic Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language