RhymeZone: anharmonic definitions

Definitions of anharmonic:

adjective: Not harmonic. Inharmonic.
adjective: (mechanics) Exhibiting anharmonicity
adjective: (geometry) Describing the section of a line by four points, A, B, C, D, when their mutual distances are such that AB divided by CB is not equal to AD divided by CD.

(Definitions from Wiktionary)