HARMONIC

I. adjective Date: 1570 musical , of or relating to musical harmony or a ~, pleasing to the ear ; harmonious , of an integrated nature ; congruous , ~ally adverb II. noun Date: 1777 1. overtone , a flutelike tone produced on a stringed instrument by touching a vibrating string at a nodal point, a component frequency of a complex wave (as of electromagnetic energy) that is an integral multiple of the fundamental frequency