/ Dictionary / Index H harmonicon: Meaning and Definition of Find definitions for: har•mon•i•con Pronunciation: (här-mon'i-kun), [key] — n. harmonica (def. 1). orchestrion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. harmonic motion harmonic progression 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