subharmonic 
noun
An oscillation with a frequency equal to an integral submultiple of another frequency.The Grimm Ambient drags even lower with ‘Bathory,’ starting with thudding subharmonics, spreading out and shuddering to reluctant end....
- The subharmonics are too erratic to be electronics.
- Kosmos offers good, clean subharmonics: There is no mistracking, and it is quiet and clean.
adjective
Denoting or involving a subharmonic.Peak amplitude of subharmonic component was measured by continuously averaging the acoustic spectrum until a steady value was reached....
- Acoustic guitar and bass receive treatment from a dbx 120 subharmonic processor.
- His most important work was in function theory, in particular Nevanlinna theory and the growth of subharmonic functions.
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