1. The doctrine or science of musical sounds. Grave harmonics, low sounds which accompany every perfect consonance of two sounds.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• armonics,
• hermonic,
• hamonic,
• harmoniuos,
• hermonies,
• harmonius,
• harmonous,
• hermonica,
• harmonises,
• hamonica,
• hamonies,
• harmonys,
• harmonick,
• harmonicc,
• haremonica,
• harmonicas,
• harminics,
• harmonnics,
• harmonicss,
• harmonios

• harmonical,
• harmonious,
• harmoniously,
• harmonizable,
• Harryman,
• harmonized,
• harmonizer,
• harmony,
• Harmann,
• harmonize,
• harriman,
• harmonic,
• Harman,
• harmonise,
• harmonica,
• harmonic law,
• harmonium,
• harmonised,
• harmonically,
• Harmon,
• Harmonies,
• harmoniser.

The adjective form of the word "harmonics" is "harmonic".