/ Dictionary / Index S subharmonic: Meaning and Definition of Find definitions for: sub•har•mon•ic Pronunciation: (sub"här-mon'ik), [key] — n. Physics. an oscillation that has a frequency which is an integral submultiple of the frequency of a related oscillation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subhalide subhead Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language