anharmonic

[an-hahr-mon-ik]
adjective Physics.
of or pertaining to an oscillating system that is not undergoing simple harmonic motion.

Origin:
an-1 + harmonic; modeled on French anharmonique

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World English Dictionary
anharmonic (ˌænhɑːˈmɒnɪk)
 
adj
physics of or concerned with an oscillation whose frequency is not an integral factor or multiple of the base frequency

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Example sentences
These dangerous fluctuations can be suppressed by an anharmonic coupling between bending and stretching modes.
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