iso·chro·mat \| ̷ ̷ ̷ ̷krō|mat, ˌ ̷ ̷ ̷ ̷ˈkrōˌm-\noun (-s) Etymology:is- + -chromat (from Greek chrōmat-, chrōma color) — more at chromatic : a graph showing intensity as a function of voltage for a given wavelength of the output from an X-ray source