Meaning

noun a tone that is a component of a complex sound

noun any of a series of musical tones whose frequencies are integral multiples of the frequency of a fundamental

adjective of or relating to harmony as distinct from melody and rhythm; - Ralph Hill

originFrom Latin harmonicus, from Ancient Greek ἁρμονικός (harmonikós), from ἁρμονία (harmonía, “harmony”). By surface analysis, harmony + -ic. Doublet of armónico.

Etymology from Wiktionary, CC BY-SA 3.0