harmonic

(physics) A component frequency of the signal of a wave that is an integer multiple of the fundamental frequency.

(music) The place where, on a bowed string instrument, a note in the harmonic series of a particular string can be played without the fundamental present.

(mathematics) One of a class of functions that enter into the development of the potential of a nearly spherical mass due to its attraction.

(CB radio slang) One's child.