overtone

Concise Oxford English Dictionary © 2008 Oxford University Press:
overtone/ˈəʊvətəʊn/

▶noun

• 1 a musical tone which is a part of the harmonic series above a fundamental note, and may be heard with it.

• 2 a subtle or subsidiary quality, implication, or connotation.

• 3 Physics a component of any oscillation whose frequency is an integral multiple of the fundamental frequency.

– origin C19: from over- + tone, suggested by Ger. Oberton.